Expressing their desire to tackle climate change seriously, world leaders commenced climate talks in Paris on Sunday with a ceremonial tree planting. Presidents, prime ministers, and ministers of environmental affairs from around the world waved lighters in the air and sang “Colors of the Wind” from the Disney movie Pocahontas, while U.S. President Barack Obama, British Prime Minister David Cameron, and Russian President Vladimir Putin had the honor of putting the sapling in a hole in the ground and patting dirt on its roots.