Have you seen the Greenpeace posters in the Copenhagen airport, for the climate change conference that opened yesterday? Obama and Merkel here, but there are several others too.I think they got the idea from the Star Trek episode, "The Deadly Years," where the ship's officers start to age rapidly. Here's Spock and friends, working on the formula to go back in time and save Earth's polar bears.
Also time-traveling to surgically alter Mr. Obama's ears at birth. Was he born in the USA? No way, he was born on Vulcan! Like Tuvok, the Vulcan first mate on Star Trek: Voyager.
[Sorry, another image I saved long ago without noting its source. Very bad of me. I think I'll use these right away, and then they sit so long, I forget where I found them.]