c5bad647_Methane_Catastrophe__Gas
[Symbol] CO¸2 [Significance] The main greenhouse gas largely under the control of human beings. It accounts for most (roughly two-thirds) of global warming. Though there is a natural level of atmospheric carbon dioxide (with some variability over time), human beings are increasing the presence of this gas in the atmosphere at an unprecedented and likely catastrophic rate. This anthropogenic (human-caused) carbon dioxide will decline with the inevitable depletion of fossil fuels, but global warming will nonetheless increase for some time thereafter. Once the dumping of carbon dioxide into the atmosphere ceases, the amount of carbon dioxide will decline over the centuries, but an appreciable quantity (perhaps 7%) will still be around in 100,000 years. [Gas] 
Carbon dioxide
O x y g e n
W a t e r v a p o r
C a r b o n d i o x i d e
M e t h a n e
H y d r o g e n s u l f i d e
H y d r o x y l
O z o n e
Methane Catastrophe
Gas