More than 5,200 cities and towns in 135 countries worldwide switched off their lights for Earth Hour 2011 alone, sending a powerful message for action on climate change. It also ushered in a new era with members going Beyond the Hour to commit to lasting action for the planet. Without a doubt, it’s shown how great things can be achieved when people come together for a common cause. This Earth Hour 2012: 8.30pm, Saturday 31 March, celebrate your action for the planet with the people of world by switching off your lights for an hour, then go beyond the hour.

Discover where food really comes from and what it means for our health. In Food, Inc., filmmaker Robert Kenner lifts the veil on the American food industry, exposing the highly mechanized underbelly that has been hidden from the American consumer with the consent of the government's regulatory agencies, USDA and FDA.

We are the only species on earth that cooks its food - and we are also the cleverest species on the planet. The question is: do we cook because we're clever and imaginative, or are we clever and imaginative because our ancestors discovered cooking? A captivating BBC documentary about how our diet played a role in the evolution of the human brain.