According to the U.S.E.P.A.,
- Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas and oil), solid waste, trees and wood products, and also as a result of certain chemical reactions (e.g., manufacture of cement). Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.
- Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.
- Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of fossil fuels and solid waste.
- Hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. Fluorinated gases are sometimes used as substitutes for stratospheric ODS (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). These gases are typically emitted in smaller quantities, but because they are potent greenhouse gases, they are sometimes referred to as ("High GWP gases").
Some gases are more effective than others at making the planet warmer and "thickening the Earth's blanket."For each greenhouse gas, a GWP has been calculated to reflect how long it remains in the atmosphere, on average, and how strongly it absorbs energy. Gases with a higher GWP absorb more energy, per pound, than gases with a lower GWP, and thus contribute more to warming Earth.
There is no higher authority in the world than the U.S.E.P.A. to consult. Therefore, to stop runaway global warming, all formation and production of CO2, CH4, NO, and GWP's must cease immediately.
- The latest results from MIT indicate runaway global warming has begun: http://www.technologyreview.com/view/426608/how-likely-is-a-runaway... .
- These are scientific fact and hypotheses, as closely as they can be ascertained, as of Dec 12, 2013.