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Over the last few years, I became aware of this hidden revolution taking place around the world: the buying up of vast swaths of land by foreign entities from beneath its occupiers. Soaring grain prices in 2007/2008 led to countries such as Saudi Arabia and South Korea worrying about their national food security and buying up overseas land.

Food and Agriculture Organisation chief José Graziano da Silva demands high noon on land grabs that jeopardise food security

Omot Ochan was sitting in a remnant of forest on an old waterbuck skin and eating maize from a calabash gourd. He was lean and tall, wearing only a pair of combat pants. Behind him was a straw hut, where bare-breasted women and barefoot children cooked fish on an open fire.

The scale of the rush by speculators, pension funds and global agri-businesses to acquire large areas of developing countries is far greater than previously thought, and is already leading to conflict, hunger and human rights abuses, says Oxfam.

NASA Study Goes to Earth's Core for Climate Insights The latest evidence of the dominant role humans play in changing Earth's climate comes not from observations of Earth's ocean, atmosphere or land surface, but from deep within its molten core.

Berkeley Earth's land surface temperature data from 1800 to 2009, showing overall warming since the industrial revolution