Laserfiche WebLink
Table 18 <br />Global Warming Potentials and Atmospheric Lifetimes <br />Gas <br />Atmospheric Lifetime <br />Global Warming Potential' <br />(100 Year Horizon) <br />Carbon Dioxide (CO2) <br />2 <br />1 <br />Methane (CH4) <br />12 <br />28-36 <br />Nitrous Oxide (NO) <br />114 <br />298 <br />Hydrofluorocarbons (HFCs) <br />1-270 <br />12-14,800 <br />Perfluorocarbons (PFCs) <br />2,600-50,000 <br />7,390-12,200 <br />Nitrogen trifluoride (NF3) <br />740 <br />17,200 <br />Sulfur Hexafluoride (SF6) <br />3,200 <br />22,800 <br />Notes: <br />Source: http://www3.epa.gov/climatechange/ghgemissions/gases.html <br />(1) Compared to the same quantity of CO2 emissions. <br />(2) Carbon dioxide's lifetime is poorly defined because the gas is not destroyed over time, but instead moves among different parts of the <br />ocean -atmosphere -land system. Some of the excess carbon dioxide will be absorbed quickly (for example, by the ocean surface), but some will <br />remain in the atmosphere for thousands of years, due in part to the very slow process by which carbon is transferred to ocean sediments. <br />Cabrillo at First Mixed -Use Residential Project <br />1931djH Air Quality, Global Climate Change, HRA and Energy Impact Analysis <br />60 19386 <br />