The document profiles 4 scientists and their areas of study related to climate change: - Robin Bell studies collapsing and melting ice sheets in Antarctica. - Ken Caldera examines ocean acidification, climate intervention, and past mass extinctions in relation to current carbon issues. - Bill Easterling researches how global warming may affect global food supplies. - Stephen Schneider assesses the economic and ecological impacts of human-caused climate changes. The summary then outlines potential effects of climate change like extinction, redrawn coastlines, diminished food supplies, and discusses the unnatural speed of current warming compared to past climate shifts. People will need to transition to non-fossil fuel energy to curb trillions