bbc - climate clearly out of balance

Fifty thousand scientists say it is time to stop looking at global warming and start acting
Global warming is no longer something to be looked at but acted upon, says the world's largest group of scientists.
With 50,000 members across 137 countries, the American Geophysical Union says that the global temperature is "clearly out of balance and is warming" and is "not natural."
AGU is calling for a reduction by half in human emissions - by 2100 - reports the BBC, a timeframe that some may doubt is possible, while others will hold concern that target is too distant to avoid risk of extinction level events.