In 2011, Greenpeace - the world's largest environmental campaigning organisation - celebrates its 40th anniversary. French photographer Pierre Gleizes has shot some of the organisation's best known photographs over the three decades he has worked...

Watch as Sim McKenna - climber and Greenpeace activist - prepares to occupy the Stena Don oil rig as it drills in the deep waters of the Arctic. Hear how his time in the Gulf of Mexico after BP's Deepwater Horizon disaster has helped drive him to...

Watch the dramatic occupation of Cairn Energy's Arctic drilling rig. Four of our climbers scaled the rig and stopped the drilling for over 40 hours.