Ice Anybody?

This Summer, Arctic sea ice was at its third lowest extent since satellite records began in 1979. In those 3 decades, the sea ice has declined by 20 to 25% and shows no sign of reversing. It's predicted that the Arctic Sea will be ice free during the Summer months by 2050. Since dwindling polar ice will, in itself, lead to further warming, this prediction may prove to be conservative.

Meanwhile, the vast majority of the world's glaciers are also in decline (According to the World Glacier Monitoring Service). Disturbingly, this effect seems to be accelerating. For example, in Peru, home to 70% of the world's tropical glaciers, they've lost around 22% of them in the last 30 years. They could lose the rest over the next 20 years.

If all this isn't proof global warming is already under-way, I don't know what is.