Researcher by day and activist by night, Joseph Harris was leading an untenable double life that eventually landed him in prison.

They may not have so many trees to hug, but city slickers lead more environmentally friendly lives than their country cousins.

The glaciers that feed Asia's largest rivers aren't going to vanish soon – but 60 million Asians will suffer water shortages by 2050.

The Himalayan glaciers that feed Asia's five largest rivers are in no danger of disappearing by 2035, as claimed in the Intergovernmental Panel on Climate Change's most recent report. In fact, only the glaciers that melt into the Ganges are shrinking, according to the most detailed analysis yet of how climate change will affect key Asian glaciers.

A rush to extract methane from the depths of Africa's Lake Kivu could trigger a huge upwelling of suffocating gas, potentially affecting over 2 million people.