A Dutch court has ordered the government to cut greenhouse gas emissions by at least 25% by 2020, in a case environmentalists hope will set a precedent for other countries.
Campaigners brought the case on behalf of almost 900 Dutch citizens.
They argued the government had a legal obligation to protect its citizens from the dangers of climate change.
Government lawyers did not immediately comment on the ruling at the court in The Hague.
Jasper Teulings from Greenpeace called it a "landmark case".
"It shifts the whole debate. Other cases are being brought in Belgium, the Philippines. This is the start of a wave of climate litigation."
But, don't worry, they'll be wishing for warmer days when the first European and North American crop failures hit ... starvation has a way of shattering smug value systems:
The past few decades have been characterized by a period of relatively high solar activity. However, the recent prolonged solar minimum and subsequent weak solar cycle 24 have led to suggestions that the grand solar maximum may be at an end. Using past variations of solar activity measured by cosmogenic isotope abundance changes, analogue forecasts for possible future solar output have been calculated. An 8% chance of a return to Maunder Minimum-like conditions within the next 40 years was estimated in 2010 (ref. 2). The decline in solar activity has continued, to the time of writing, and is faster than any other such decline in the 9,300 years covered by the cosmogenic isotope data1. If this recent rate of decline is added to the analysis, the 8% probability estimate is now raised to between 15 and 20%.
... and a bit more; something to do with the Thames freezing.