Sunday, January 26, 2020
Development and Importance of Solar Electricity
Development and Importance of Solar Electricity Noxious gasses, acrid fumes, scarred landscapes, a massive carbon footprint, and a warming atmosphere. These are the consequences of obtaining energy from nonrenewable resources such as coal, natural gas, and petroleum. These are the sources we use to produce electricity, endangering the very planet we live on through their harmful impacts on the environment. These destructive effects include, but are not limited to, the creation of a blanket of carbon dioxide which traps heat in the atmosphere and thus warms it, water and ground contamination from spills and other mishaps, and air pollution. There is a better answer to obtaining electricity, one which reduces greenhouse gas emissions and has a much, much smaller impact on the environment: the photovoltaic (PV) cell, also known as the solar cell. Because the solar cell has these incredible benefits, our nation should invest much more money into research and development of solar power to generate electricity. Thanks to considerable public investment in green energy that came from the US, Germany, and China during the Great Recession, recent American and European regulations that have de-incentivized coal power plants [,] competition among manufacturers, and technological know-how (R. Meyer How Solar and Wind Got So Cheap, So Fast 1), solar energy has become much cheaper, and thus, economically viable. While costs do vary between regions and types of solar panels, the average cost is around 60 cents per watt (R. Meyer How Solar and Wind Got So Cheap, So Fast 1). Solar cell technology has been around since 1839 when French physicist Alexandre Edmond Becquerellar first demonstrated the photovoltaic effect, or the ability of a solar cell to convert sunlight into electricity (R. Meyer History of Solar Power 1). Forty-four years later, in 1883, the American inventor Charles Fritts created the worlds first rooftop solar array in New York (R. Meyer History of Solar Power 1). Up to this point, however, the process behind the photovoltaic effect (also known as the photoelectric effect) was not understood. The process continued to elude scientists until 1905 when Albert Einstein wrote a paper explaining the photoelectric effect (R. Meyer History of Solar Power 1). Together, Becquerellar and Einstein paved the way for the development of photovoltaic technology. During the 1950s, the U.S. military funded research on PV technologys potential to power satellites (R. Meyer History of Solar Power 1), and in 1964 the National Aeronautics and Space Administra tion (NASA) launched its first satellite equipped with solar panels. However, it wasnt until the Arab oil embargo of 1973 and the ensuing energy crisis that the United States started to earnestly develop solar energy. The U.S. governments first step was passing the Solar Heating and Cooling Demonstration Act of 1974 (R. Meyer History of Solar Power 1), which created the Solar Energy Coordination and Management Project, an organization designed to direct agencies like NASA, the National Science Foundation, and the Department of Housing and Urban Development to improve solar energy technology (R. Meyer History of Solar Power 1). When Jimmy Carter became President in 1977, he labeled the energy crisis as the moral equivalent of war and made energy policy a top priority of his administration (R. Meyer History of Solar Power 2). That same year, he created the Department of Energy and pushed through Congress several acts relating to renewable energy use. The goal of Carters efforts and th ose of Congress was to make solar viable and affordable and market it to the public (R. Meyer History of Solar Power 2). In facilitating this goal, Congress created the commercial investment tax credit (ITC) and the residential energy credit (or residential ITC) to provide financial incentives for the public to purchase solar properties (R. Meyer History of Solar Power 2). Unfortunately, the tax credit failed to increase Americas use of solar power, as solar comprised a negligible amount of electricity generation (R. Meyer History of Solar Power 2). However, declining domestic oil production and rising oil imports throughout the early 2000s (R. Meyer History of Solar Power 2) led to the Energy Policy Act of 2005 (EPAct). This act raised the commercial ITC to a temporary 30 percent rate and reinstated the residential ITC [which had expired in 1985] (R. Meyer History of Solar Power 2). Today, in addition to tax credits and grants, the government continues to heavily subsidize the indu stry with research and development, commercialization, and regulatory support (R. Meyer History of Solar Power 3). In 1985, total renewable energy production and consumption amounted to 6084 trillion Btu. Out of that amount, less than half trillion Btu came from solar power, less than 0.0008 percent of total renewable energy. In comparison in 2015, total renewable energy production and consumption amounted to 9466 trillion Btu. Out of that amount, 427 trillion Btu came from solar power, about 4.5 percent of total renewable energy. This means from 1985 to 2015 total renewable energy production and consumption increased by 3382 trillion Btu, while in the same time period, solar energy consumption and production has increased by around. 426.5 trillion Btu (US EIA Monthly Energy Review January 2017 151). Electricity is an extremely important factor of our everyday lives, but we should obtain this essential resource much more responsibly through solar power. Solar power produces significantly less greenhouse gas emissions (more specifically carbon dioxide) and has a very high technical potential. According to the United States Environmental Protection Agency (EPA), greenhouse gases are gases that trap heat in the atmosphere (EPA 1). In 2014, 81% of all greenhouse gas emissions in the United States came from carbon dioxide, which amounted to 556,470,000 metric tons (EPA 1). This carbon dioxide enters the atmosphere through burning fossil fuels (such as coal, natural gas, and oil), as well as solid waste, trees and wood products, and also as a result of certain chemical reactions (EPA 1). According to the EPA, 37% of carbon dioxide produced comes from generation of electricity (EPA 1). If our nation used solar power to generate electricity, the amount of carbon dioxide we produce would drastically decrease, as the carbon footprint of the solar industry is much, much smaller than that of the oil or gas business (R. Meyers The Solar Industry Has Paid Off Its Carbon Debts 2). This is made possible because the energy put into making solar panels, such as quart and copper be[ing] mi ned. The raw materials be[ing] converted into wafers, then [being] encased in protective material Has the solar industry really saved any energy at all? (R. Meyers The Solar Industry Has Paid Off Its Carbon Debts). Researchers at the University of Utrecht and the University of Groningen have determined that the answer is yes, using a type of research called lifecycle analysis, which investigates the total environmental impact of a product over time (R. Meyer The Solar Industry Has Paid Off Its Carbon Debts 2). According to Meyers, this kind of research is tricky: researchers must find and calibrate years of economic and energy data, collected across 40 years, in many different countries, with different goals in mind (R. Meyers The Solar Energy Has Paid Off Its Carbon Debts 2). Scott Hershey, a professor of chemical and environmental engineering at Olin College, stated in an email that their [the researchers] methods are solid, but this type of analysis is fraught with assumptions (R . Meyer The Solar Energy Has Paid Off Its Carbon Debts 2). While exact numbers are not known relating to how much carbon dioxide solar power produces, it is known that it is much less than amounts from nonrenewable sources. However, this carbon dioxide can be removed from the atmosphere by being absorbed by plants as part of the biological carbon cycle. Unfortunately, all plants have a limit to how much carbon dioxide they can absorb, and all the plants in the world cannot absorb all the carbon dioxide just the U.S. produces (EPA 1). Solar power produces much less carbon dioxide than power plants burning fossil fuels, and there is very high technical potential. Technical potential refers to the achievable energy generation of a particular technology given system performance, topographical limitations, environmental, and land-use constraints (Lopez, Roberts, Heimiller, Blair, Porro 1). In other words, it is the amount of energy a technology can produce within strict parameters. The process for generating these technical potential estimates is very exact, requiring complex calculations and surveying of the land. However, there are three different types of solar technologies, and the technical potential for each drastically varies. The three different types of solar technologies are utility-scale PV, rooftop PV, and concentrating solar power (CSP). According to NREL, utility-scale PV is generation of electricity through large-scale PV (NREL 3). However, NREL has estimated that 3,212,324 km2 of land is available for utility-scale solar production in the U.S. (Anthony Lopez, Billy Roberts, Donna Heimiller, Nate Blair, and Gian Porro 10,11), out of 9,833,517 km2, which is the total land area of the United States (The World Factbook 1). This means 32.66% of U.S. land is suitable for production of electricity, which could produce up to 282,844,911 gigawatt hours (GWh) of electricity (Anthony Lopez, Billy Roberts, Donna Heimiller, Nate Blair, and Gian Porro 10, 11). In 2015, the United States produced 4.103 trillion (4,103,000,000) kilowatt hours (KWh) of electricity, which is equal to 4,103,000 gigawatt hours (GWh) of electricity (Philipp Beiter, and Tian Tian 7)[i]. In other words, using just utility-scale solar power plants, we could produce almost 68 percent of all the energy we consume using just solar power! However, many fossil fuel executives and politicians are opposed to solar power, among other reasons, because they say that it is costly and the construction of the solar panels still cause emissions. These critics are correct: solar power is still costly and the manufacture of solar power does create emissions. However, historically, prices today are much lower than those at the turn of the century. In an email from Jenny Chase, the head of the solar department at Bloomberg New Energy Financial, she stated that reductions in the cost of solar panels have to do with the experience curve. This means that the more of something we do, the better we get at it (Robinson Meyer How Solar and Wind Got So Cheap So Fast 2). Cost cutbacks also have to do with manufacturers improving their fabrication of materials in photovoltaic cells, including an essential material called polysilicon. Prices for polysilicon got as high as $400 per kilogram. That enticed more manufacturers to get into the indu stry, creating a supply glut and a price crash (Robinson Meyer How Solar and Wind Got So Cheap So Fast 2). As a result, current prices are much lower than prices from years ago. While solar panels themselves create very few greenhouse gas emissions, their production can, depending on where they are produced. According to Robinson Meyer, many solar panels are manufactured in Europe and China (Robinson Meyer The Solar Industry Has Paid Off Its Carbon Debts 2). However, the environmental situations in these two regions are drastically different, because China relies on coal burning for much of its electricity, and it has fairly lax environmental protections. The EU [European Union], on the other hand, already heavily relies on clean energy, and it has a large and entrenched environmental bureaucracy (Robinson Meyer The Solar Industry Has Paid Off Its Carbon Debts 2). This means that solar panels produced in China are more than likely produced in factories require a lot of energy and produce relatively dirty emissions (Robinson Meyer The Solar Industry Has Paid Off Its Carbon Debts 3. Meanwhile, in Europe, factories producing solar panels require relatively litt le energy and produce cleaner emissions (Robinson Meyer The Solar Industry Has Paid Off Its Carbon Debts 3). However, China has toughened its environmental protection laws, as they attempt to curb pollution. This means that in the future, China may produce solar panels with fewer emissions. If you dont believe solar power is the better choice for producing our electricity, there are other options to choose from that still protects our environment, including wind, geothermal, tidal, hydroelectric, and biomass. However, if none of those options suit you either, then think about the consequences of using nonrenewable sources. Pollution. Changes in global weather patterns. Flooding. Drought. Desertification. Health consequences. These consequences spell out the destruction of the planet we live on. It may take years, but with continuous reliance on fossil fuels, these effects are inevitable. We still have a chance to turn around, by using solar power, or other forms of renewable resources. Yes, this would require sacrifices and change. It would require courage to go against the status quo. It would require risk. But if we chose to use solar power to generate electricity, we could make the world a little bit better. For ourselves, our world, and our posterity. Works Cited Beiter, Philipp, and Tian Tian. 2015 Renewable Energy Data Book. 2015 Renewable Energy Data Book | Department of Energy. U.S. Department of Energy (U.S. DOE), Nov. 2016. Web. 04 Mar. 2017. . Bolinger, Mark, and Joachim Seel. Utility-Scale Solar 2015: An Empirical Analysis of Project Cost, Performance, and Pricing Trends in the United States. Electricity Markets and Policy Group. Lawrence Berkeley National Laboratory, Aug. 2016. Web. 04 Mar. 2017. . History of Solar Power. IER. U.S. Department of Energy (U.S. DOE), 18 Feb. 2016. Web. 04 Mar. 2017. . Lopez, Anthony, Billy Roberts, Donna Heimiller, Nate Blair, and Gian Porro. U.S. Renewable Energy Technical Potentials: A GIS-Based Analysis. National Renewable Energy Laboratory Documents Archive. U.S. Department of Energy (U.S. DOE), July 2012. Web. 04 Mar. 2017. . Meyer, Robinson. How Solar and Wind Got So Cheap, So Fast. The Atlantic. Atlantic Media Company, 02 Dec. 2015. Web. 04 Mar. 2017. . Meyer, Robinson. The Solar Industry Has Paid Off Its Carbon Debts Robinson Meyer. QOSHE. The Atlantic, 13 Dec. 2016. Web. 04 Mar. 2017. . Meyer, Robinson. The Solar Industry Has Paid Off Its Carbon Debts. The Atlantic. Atlantic Media Company, 13 Dec. 2016. Web. 04 Mar. 2017. . Overview of Greenhouse Gases. EPA. Environmental Protection Agency, 14 Feb. 2017. Web. 04 Mar. 2017. . Thetford, Kyle. Charting the Fall of Solar Prices. The Atlantic. Atlantic Media Company, 19 Aug. 2013. Web. 04 Mar. 2017. . The World Factbook: UNITED STATES. Central Intelligence Agency. Central Intelligence Agency, 12 Jan. 2017. Web. 04 Mar. 2017. . [i] The actual report gave the amount of energy in quadrillion Btu, but all my other sources gave it in terms of watts, so in this case, I converted Btu to watts.
Saturday, January 18, 2020
Implementation of Risc Processor in Fpga Using Verilog Essay
Reduced instruction-set computers (RISC) are designed to have a small set of instructions that execute in short clock cycles, with a small number of cycles per instruction. RISC machines are optimized to achieve efficient pipelining of their instruction streams. The machine also serves as a starting point for developing architectural variants and a more robust instruction set Designers make high-level tradeoffs in selecting an architecture that serves an application. Once architecture has been selected, a circuit that has sufficient performance (speed) must be synthesized. Hardware description languages (HDLs) play a key role in this process by modeling the system and serving as a descriptive medium that can be used by a synthesis tool. 2. RISC (Reduced Instruction Set Computer) The nature of RISC architecture and semiconductors rapid technical improvements, RISC embedded platforms have become the best choice for embedded applications. RISC performance characteristics: Power Critical Battery powered and typically less than 2 Watts of power consumption for a whole SBC using an ARM processor, compared to around 15+ Watts for a x86-based SBC. Space Critical With a low power solution, the main system can fit into very compact space, eliminating heat dissipation concerns. Environmental Critical Because of the lack of heat generation, the RISC system can be fully enclosed for total protection from the environment Cost Critical RISC embedded solutions usually come with application-oriented processors that provide a lower cost of ownership because of faster time to market, less development risk and greater overall added value. Typical RISC applications: â⬠¢ Industrial mobile platforms â⬠¢ Touch based Human Machine Interface (HMI) â⬠¢ Point of information (POI) or Point of Scales (POS) â⬠¢ In vehicle ââ¬â Telemetric â⬠¢ Data collector â⬠¢ Security controller 2.1 STEPS INVOLVED IN THE PROJECT 3. 3. Architecture of RISC Stored Program Machine [pic] The machine consists of three functional units: â⬠¢ Processor â⬠¢ Controller â⬠¢ Memory Program instructions and data are stored in memory. In program-directed operation, instructions are fetched synchronously from memory, decoded, and executed to âž ¢ operate on data within the arithmetic and logic unit (ALU) âž ¢ change the contents of storage registers âž ¢ change the contents of the program counter (PC), instruction register (IR) and the address register (ADD_R) âž ¢ change the contents of memory, âž ¢ Retrieve data and instructions from memory control the movement of data on the system busses. The instruction register contains the instruction that is currently being executed. The program counter contains the address of the next instruction to be executed and the address register holds the address of the memory location that will be addressed next by a read or write operation 3.1 RISC_SPM: Processor The processor includes registers, datapaths, control lines, and an ALU capable of performing arithmetic and logic operations on its operands, subject to the opcode held in the instruction register. A multiplexer Mux_l, determines the source of data for Bus_l, and a second mux, Mux_2, determines the source of data for Bus_2. The input datapaths to Mux_l are from four internal general-purpose registers (RO, Rl, R2, R3), and from the Pc. The contents of Bus_l can be steered to the ALU, to memory, or to Bus_2 (via Mux_2). The input datapaths to Mux_2 are from the ALU, Mux_l, and the memory unit. Thus, an instruction can be fetched from memory, placed on Bus_2, and loaded into the instruction register. A word of data can be fetched from memory, and steered to a general-purpose register or to the operand register (Reg_Y) prior to an operation of the ALU. The result of an ALU operation can be placed on Bus_2, loaded into a register, and subsequently transferred to memory. A dedicated register (Reg_Z) holds a flag indicating that the result of an ALU operation is 0. 3.2 RISC_SPM: Controller The timing of all activity is determined by the controller. The controller must steer data to the proper destination, according to the instruction being executed. Thus, the design of the controller is strongly dependent on the specification of the machineââ¬â¢s ALU and datapath resources and the clocking scheme available. Here a single clock is used, and execution of an instruction is initiated on a single edge of the clock (the rising edge). The controller monitors the state of the processing unit and the instruction to be executed and determines the value of the control signals. The controllerââ¬â¢s input signals are the instruction word and the zero flag from the ALU. The signals produced by the controller are identified as follows: [pic] Thus the control unit âž ¢ determines when to load registers âž ¢ selects the path of data through the multiplexers âž ¢ determines when data should be written to memory âž ¢ Controls the three-state busses in the architecture. RISC SPM: Instruction Set The machine is controlled by a machine language program consisting of a set of instructions stored in memory. So, in addition to depending on the machineââ¬â¢s architecture, the design depends on the processor instruction set (i.e., the instructions that can be executed by a program). A machine language program consists of a stored sequence of 8-bit words (bytes). The format of an instruction of RISC_SPM can be long or short depending upon the operation. Short instructions have the format | opcode | source | destination | | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | Each shot instruction requires one byte of memory. The word has a 4-bit opcode, a 2-bit source register address, and a 2-bit destination register address. Long instructions have the format | opcode | source | destination | | 0 | 1 | 1 | 0 | 1 | 0 | Donââ¬â¢t |Donââ¬â¢t | | | | | | | |cares |cares | | address | | 0 | 0 | 0 | 1 | 1 | 1` | 0 | 1 | A long instruction requires 2 bytes of memory. The first word of a long instruction contains a 4-bit opcode. The remaining 4 bits of the word can be used to specify the address of a pair of source and destination registers, depending on the instruction. The second word contains the address of the memory word that holds an operand required by the instruction. The instruction mnemonics and their actions are limited below. Single-Byte Instructions â⬠¢ NOP: Here no operation is performed; all registers retain their values. The address of the source and destination registers is dint careââ¬â¢s, they have no effect. â⬠¢ ADD: Adds the contents of the source and destination registers and stores the result into destination register. â⬠¢ AND: Forms the bitwise-and of the contents of the source and destination registers and stores the result into the destination registers. â⬠¢ NOT: Forms the bitwise-and of the contents of the source register and stores the result into the destination register. â⬠¢ SUB: Subtracts the contents of the source register from destination register and stores the result into source register. Two-Byte Instructions â⬠¢ RD: Fetches a memory word from the location specified by the second byte and loads the result into the destination register. The source register bits are donââ¬â¢t cares which means that they are unused. â⬠¢ WR: Writes the contents of the source register to the word in memory specified by the address held in the second byte. The destination register bits are donââ¬â¢t cares which means that they are unused. â⬠¢ BR: Branches the activity flow by loading the program counter with the word at the location (address) specified by the second byte of the instruction. The source register bits and the destination register bits are donââ¬â¢t cares which means that they are unused. â⬠¢ BRZ: Branches the activity flow by loading the program counter with the word at the location (address) specified by the second byte of the instruction if zero flag register is asserted. The source register bits and the destination register bits are donââ¬â¢t cares which means that t hey are unused. Instruction set of RISC_SPM machine | Instruction | Instruction Word | Action | | | Opcode | Source | Destination | | | NOP | 0000 | | | None | | ADD | 0001 | src | dest | dest
Friday, January 10, 2020
Hiset Essay Topics 2018 Guide
Hiset Essay Topics 2018 Guide The Basics of Hiset Essay Topics 2018 Perform extensive research on the subject of your choice and make an impressive persuasive speech that individuals will remember for long. Not all folks are suicidal that manner. Many people wind up covering the exact same tired topics they see in the media every day, only because they can't produce a better idea. Generally, professors give a lot of freedom in picking out persuasive essay topics. For this reason, you've got to locate enough substantial evidence for the specific topic. You're a true topic enthusiast! Apparently, you ought not purposely select a topic that will bore your audience. Naturally, topics which are still relevant in 2018 are the very best. Sure, with this kind of a substantial selection of topics to select from, picking just one may be challenging. In any case, direct and indirect quotes are required to support your understanding of academic writing style. The list you will discover here is not aiming high simply to persuade people who you're right. In reality, you will find dozens of resources on the internet that is going to teach you just how to write persuasively. To begin with, if you're arranging a persuasive speech, you ought to think about a topic that could create mental pictures in the minds of your audience. There are those who do not support such decisions. You may trust us to offer expert aid for many of your academic writing needs. The goal of brainstorming is to help you receive ideas. Then you're interested in figuring out how to compose persuasive paper. Freedom of choice is fantastic. Thus, a speech should be organized. A persuasive speech resembles a difficult challenge for many students. Good persuasive essay topics need to be persuasive. Remember, they don't have to be politically correct all the time, they can be controversial. Persuasive essays share a good deal of resemblance with argumentative essays. In general, you can observe that writing a persuasive essay isn't a brain surgery. Anyway, below, you will find topic that are excellent for both scenarios. A broad subject always seems simpler to write about as you are able to discover a lot of materials about it. The issue, nevertheless, is that not all businesses can be relied upon in order to deliver quality essays on time so you need to be cautious in selecting one. On-line teachings isn't a good idea. You also debate whether the topic is politically accurate. Still, you must make your topic more specific. Qualities of a fantastic persuasive essay topic The topic needs to be specific. Most issues can have essays on all the aforementioned questions. You don't need to puzzle over an issue. There's a significant remedy to your issue!
Thursday, January 2, 2020
Same Sex Marriage Should Be Legal - 1611 Words
Same sex marriage became legal on June 26th, 2015. So, why is there still discrimination? Itââ¬â¢s legal, right? The discrimination against homosexual athletes in American sports is out of control and needs to be changed immediately. How would people feel being looked down upon being one of the only openly gay athletes in the United States? Before 2014 there was not any openly gay athletes currently playing professional sports in the United States. This shows the fear humans have when it comes to being honest about their sexuality because they know what the general public thinks about it. Discrimination is inhumane, especially when it comes to peoples beliefs. Sixty-five percent of females in the WNBA are homosexual, but are not discriminated against compared to the way male athletes are. Many gay athletes do not come out about their sexuality until after retirement because they fear what others will think. Discrimination is inhumane, especially when it comes to peoples beliefs. ââ¬Å"Saying negative comments or slurs about someoneââ¬â¢s sexuality is just as bad as insulting a player about his or her race or religionâ⬠(Griffen, 2003). Somebodyââ¬â¢s belief are how they feel about their world and they should not be judged or insulted. The United States is a unique country and a great place to live, so why should we discourage other citizens when everybodyââ¬â¢s views are their own? ââ¬Å"If people are being harassed on your team, speak out against itâ⬠(Griffen, 2003). As an athlete, only so manyShow MoreRelatedSame Sex Marriage Should Be Legal1288 Words à |à 6 Pages Marriage is not precisely the same as it used to be interpreted. For example, women used to be their husbandââ¬â¢s property. Sometimes the women were forced to marry whoever their parents wanted them to marry and most of the time they couldnââ¬â¢t leave the marriage. Nowadays women have more f reedom. 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