What scientists know well, and what's left to learn, about extreme weather and climate change.
CO2 emissions from fossil fuel have been growing steadily in the US and are projected to continue growing until 2030 and beyond if no legislation is passed to reduce emissions.
In coal-burning power plants, CO2 can be captured for transport to storage sites.
CO2 may be separated from other gases at coal-fired electric power plants and transported by pipeline to suitable storage sites.
8 gallonsÃ¢Â€Â™ worth of the energy in 10 gallons of corn ethanol comes from fossil fuels.