What if we could oust or cut petroleum products in the (let's say) next decade? What kind of impact would that have on our global warming environment. ? Currently, the EPA projects a 44% increase from 1990 or a (13 billion metric ton of CO2 equivalent by 2020.) Cutting down emissions would consist of; traveling when necessary, high-priority tree reintroduction, replace methyl t-butyl ether with oxidizing ethanol fuels, et cetera. Formulating a theory on 'how much is too much?' is not scientifically known. But speculation is!