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We use about five million tonnes of rock salt each year, most of which ends up in our lakes and rivers. There are a variety of synthetic de-icers, some more eco-friendly than others.

It is hard to shock journalists and at the same time leave them in awe of the power of nature. A group returning from a helicopter trip flying over, then landing on, the Greenland ice cap at the time of maximum ice melt last month were shaken. One shrugged and said: "It is too late already." Scary first-hand report from the glaciers in Greenland.

The 11th hour is the final moment when change is still possible. It’s fitting that Leonardo DiCaprio has named his latest film The 11th Hour. This feature documentary is a call to action.