Yale Environment 360: The key passage -- the forward-looking passage -- of President Obamas speech last week rejecting the Keystone XL pipeline came right at the end, after he rehashed all the arguments about jobs and gas prices that had been litigated endlessly over the last few years.
Ultimately, he said, if were going to prevent large parts of this Earth from becoming not only inhospitable but uninhabitable in our lifetimes, were going to have keep some fossil fuels in the ground rather than burn them and...