You could say Australian-born Julian Assange has swapped his long-time interest in network security flaws for the far-more-suspect flaws of even bigger targets: governments and corporations.
Break down the oil slick, keep it off the shores: grounds for pumping toxic dispersant into the Gulf, says BP. It's sparing some beaches, but at devastating cost to the health of the deep sea.
Lewis Pugh is regarded as the greatest cold-water swimmer in history. His swims have given him a sea-level view of our planet, and inspired him to do his bit to help preserve it.