Fluorinated Gases (HFCs, PFCs, SF 6) Fluorinated gases are emitted in smaller quantities than the other greenhouse gases, but what they lack in volume they can make up in potency and long lifespans in the atmosphere, ranging from 1270 years for HFCs to ,000 years for PFCs and about 3,0 years for SF6 Greenhouse gas emissions and atmospheric concentrations have increased over the past 150 years Emissions of several important greenhouse gases that result from human activity have increased substantially since largescale industrialization began in the mid1800s Carbon dioxide, or CO2, is a greenhouse gas that is emitted by the natural carbon cycle and by human activities, such as burning fossil fuels, notes the Environmental Protection Agency (EPA) Normally, CO2 gas emitted into the atmosphere is removed in roughly equal amounts by oceans and plants
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