When fossil fuels are burned, carbon dioxide is released. Large-scale burning of fossil fuels may put too much carbon dioxide into the atmosphere and contribute to global warming. What would be one effect of global warming?
A.It could be too hot on Earth to support life.
B.Organisms will move to cooler areas and overpopulate them.
C.Agriculture could no longer be possible because of droughts.
D.It could cause gradual thawing of ice caps and increase ocean levels.