Geoengineering - the deliberate, large-scale manipulation of the earth's climate to offset global warming - is a nightmare fix for climate change.
Some studies suggest that the Arctic Ocean may be ice-free by the end of the century.
Nowhere has the political power of coal been more obvious than in presidential campaigns.
President Obama is in no danger of being judged by history as an eco-radical.
Extracting oil from the tar sands is a nasty, polluting, energy-intensive business.
Americans don't pay much attention to environmental issues, because they aren't sexy. I mean, cleaning up coal plants and reining in outlaw frackers is hugely important work, but it doesn't get anybody's pulse racing.