Hydrocarbon fuels come almost exclusively from underground. We burn the coal or oil to obtain energy - and for hundreds of years, we have then allowed the resulting carbon dioxide to simply enter the atmosphere. Ken Wedel, Tracy High School Earth Science teacher,explores the role that underground storage of carbon dioxide can play in helping avoid damaging climate change, and the scientific challenges that face us in trying to keep the atmospheric load of carbon dioxide from continuing to grow due to burning fossil fuels. (#20234)