Climate Central: Abrupt shifts in the climate have already begun, with more possible by the end of this century according to a report released Tuesday by the National Research Council. At the same time, even gradual changes to the climate could lead to more unforeseen, sudden impacts. The report recommends creating an early warning system, instead of simply reacting to the changes.
Greenhouse gas emissions from human activities have already altered the climate. Most changes have been gradual, but the possibility...