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 China, India, Indonesia, Brazil, Mexico and Iran account for 38 percent of the world's emissions While the lowest 100 countries emit less than 3 percent of the globe's greenhouse gasesSuggested Citation"11 Emission Rates and Concentrations Of Greenhouse Gases"Institute of Medicine, National Academy of Sciences, and National Academy of Engineering 1992 Policy Implications of Greenhouse Warming Mitigation, Adaptation, and the Science BaseGreenhouse gases are gases—like carbon dioxide (CO 2), methane, and nitrous oxide—that keep the Earth warmer than it would be without themThe reason they warm the Earth has to do with the way energy enters and leaves our atmosphereWhen energy from the

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What are the greenhouse gases list- Carbon dioxide accounted for the largest percentage of greenhouse gases (80%), followed by methane (10%), nitrous oxide (7%), and other greenhouse gases (3%) Total US emissions for 19 totaled 6,558 million metric tons of CO2e and net emissions, taking sinks into account, totaled 5,769 million metric tons CO2eThis is a list of countries by total greenhouse gas (GHG) annual emissions in 16 It is based on data for carbon dioxide, methane (CH 4), nitrous oxide (N 2 O), perfluorocarbons (PFCs), sulfur hexafluoride (SF6) and hydrofluorocarbons (HFCs) emissions compiled by the World Resources Institute (WRI) The table below separately provides emissions data calculated on the basis of

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"I want to comment that the waydominant greenhouse gas in the atmosphere is not mentioned, namely water vapor," writes Ken Saunders of Pacific Palisades "Water vapor accounts for about 97 percent of the total (natural plus manemitted) greenhouse warming of the planet See, eg, John Houghton's 'The Physics of Atmospheres, 3rdA pound of N 2 O gas has the equivalent warming effect of 300 times that of one pound of carbon dioxide Based on 12 data, nitrous dioxide comprises about 6 percent of all US emissions resulting from human activities Globally, about twofifths, 40 percent, of nitrous oxide emissions are attributable to human activitiesChemicals & petrochemicals (22%) greenhouse gases can be produced as a byproduct from chemical processes – for example, CO 2 can be emitted during the production of ammonia, which is used for purifying water supplies, cleaning products, and as a refrigerant, and used in the production of many materials, including plastic, fertilizers, pesticides, and textiles

Carbon dioxide causes about percent of Earth's greenhouse effect; The greenhouse effect happens when certain gases, which are known as greenhouse gases, accumulate in Earth's atmosphere Greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ozone (O3), and fluorinated gases"A carbon footprint is the total greenhouse gas (GHG) emissions caused directly and indirectly by an individual, organization, event or product" 1 It is calculated by summing the emissions resulting from every stage of a product or service's lifetime (material production, manufacturing, use, and endoflife) Throughout a product's lifetime, or lifecycle, different greenhouse gases

Greenhouse gases come from all sorts of everyday activities, such as using electricity, heating our homes, and driving around town The graph to the right shows which activities produce the most greenhouse gases in the United States These greenhouse gases don't just stay in one place after they're added to the atmosphere US agriculture emitted an estimated 698 million metric tons of carbondioxide equivalent in 18 123 percent as carbon dioxide, 362 percent as methane, and 514 percent as nitrous oxide Increases in carbon storage (sinks) offset 116 percent of total US greenhouse gas emissions in 18 (EPA )Carbon Dioxide CO2 1 100* Methane CH4 25 12 Nitrous Oxide N2O 265 121 Chlorofluorocarbon12 (CFC12) CCl2F2 10,0 100 Hydrofluorocarbon23 (HFC23) CHF3

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This chart shows the change in global greenhouse gas emissions over time Greenhouse gases are measured in 'carbon dioxideequivalents' (CO 2 e) Today, we collectively emit around 50 billion tonnes of CO 2 e each year This is more than 40% higher than emissions in 1990, which were around 35 billion tonnesYou are About to View Greenhouse Gas (GHG) Emissions Data from Large Facilities Important Information about this Data Set This data set does not reflect total US GHG emissions The data was reported to EPA by facilities as of EPA continues to quality assure data and plans to release updated data periodically The greenhouse effect, in turn, is one of the leading causes of global warming The most significant greenhouse gases, according to the Environmental Protection Agency (EPA), are water vapor (H2O

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 The combustion of fossil fuels to generate electricity is the largest single source of CO 2 emissions in the nation, accounting for about 37 percent of total US CO 2 emissions and 30 percent of total US greenhouse gas emissions in 14 The type of fossil fuel used to generate electricity will emit different amounts of CO 2Methane, which causes 49%, and "Carbon" is shorthand for greenhouse gas emissions, including CO2, methane, nitrous oxide and Fgases These gases are released by many different types of activity – not just the burning of

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And clouds account for 25 percent The rest is caused by small particles (aerosols) and minor greenhouse gases like methane Water vapor concentrations in the air are controlled by Earth's temperature Greenhouse gases warm the planet Scientists know with virtual certainty that increasing greenhouse gas concentrations tend to warm the planet In computerbased models, rising concentrations of greenhouse gases produce an increase in the average surface temperature of the earth over time According to the 19 AGGI report, the combined heating influence of the longlived, humanproduced greenhouse gases is 314 Watts for every square meter of Earth's surface Just over 80 percent of that is due to carbon dioxide (66%) and methane (16%)

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Of the greenhouse gases, carbon dioxide (CO 2) is the most prominent Sources of atmospheric CO 2 include volcanoes, the combustion and decay of organic matter, respiration by aerobic (oxygenusing) organisms, and the burning of fossil fuels, clearing of land, and production of cement by humans These sources are balanced, on average, by a set › en español Scientists attribute the global warming trend observed since the mid th century to the human expansion of the "greenhouse effect" 1 — warming that results when the atmosphere traps heat radiating from Earth toward space Certain gases in the atmosphere block heat from escaping Longlived gases that remain semipermanently in the atmosphereA ccording to global EPA data the primary global greenhouse gas emissions are approximately 7680% carbon dioxide, 1016% methane, 57% nitrous oxide, and 23% fluorinated gases Fluorinated gases are emitted in smaller quantities, however, they have a high global warming potential

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 Greenhouse gases emissions in the EU and in the world The charts above list EU countries by total greenhouse gas (GHG) emissions in 17 and the infographic below shows the world's top greenhouse gas emitters in 15 The EU is the third biggest emitter behind China and the United State and followed by India and RussiaIn the context of contributions of different gases to atmospheric warming the concept of global warming potential (GWP) can be useful GWP is a measure of how much energy a greenhouse gas would add to atmospheric warming in a given time compared to CO 2 A molecule's GWP depends on three factors the wavelengths where the molecule absorbs Greenhouse Gases Carbon Dioxide, Water Vapor, Nitrous Oxide, Aerosols Share of Global GHG Emissions 15% A jet airliner leaves condensation trails in the sky The trails are formed by soot and water vapor from the plane engines which burn kerosene

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Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O) and ozone (O 3) Other greenhouse gases have essentially no natural sources, but are side products of industrial processes or manufactured for human purposes such as cleaning agentsCarbon dioxide, which causes 926%; Carbon dioxide Methane Ozone Nitrous oxide Chlorofluorocarbons Greenhouse gases are gases that can trap heat They get their name from greenhouses A greenhouse is full of windows that let in sunlight That sunlight creates warmth

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 The major greenhouse gases are water vapor, which causes about 3670% of the greenhouse effect on Earth (not including clouds);"Dumping greenhouse gases into the atmosphere makes the atmosphere more humid And since water vapor is itself a greenhouse gas, the increase in humidity amplifies the warming from carbon dioxide" Specifically, the team found that if Earth warms 18 degrees Fahrenheit, the associated increase in water vapor will trap an extra 2 Watts ofThe ratio of water component of the greenhouse effect to the CO 2 component is about 159 to 1 This means that the water vapor content of the atmosphere has to only fall from 041 percent to 0407 to wipe out the greenhouse effect of all the CO 2 in the atmosphere

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Much like the glass of a greenhouse, gases in Earth's atmosphere sustain life by trapping the sun's heat These "greenhouse gases" allow the sun's rays to pass through and warm the planet but prevent this warmth from escaping the atmosphere into space Without them, Earth would be too cold to sustain life as we know it Just 100 companies have been the source of more than 70% of the world's greenhouse gas emissions since 19, according to a new report The Carbon Majors Report (pdf) "pinpoints how aTwo of the top countries on this list, China and India, are experiencing rapid economic growth Also on the list are the United States and European Union members—developed countries that have historically emitted and continue to emit greenhouse gases at high levels It is important to note that these ten countries produce a majority of global emissions

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Water vapor accounts for about 50 percent; Chemicals & petrochemicals (22%) greenhouse gases can be produced as a byproduct from chemical processes – for example, CO 2 can be emitted during the production of ammonia, which is used for purifying water supplies, cleaning products, and as a refrigerant, and used in the production of many materials, including plastic, fertilizers, pesticides, and textilesMost notably, percapita greenhouse gas emissions from primary sources in San Francisco are only 61 percent of regional average The city's "green" status is likely attributable to relatively clean industries, a knowledgebased economy, a robust public transit system, limited parking and a dense land use pattern

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