Agence France-Presse: US President Barack Obama hailed Thursday what he said was an “historic consensus” on battling climate change between the leaders of the world’s 17 leading economic powers. “We also agree that developed countries, like my own, have a historic responsibility to take the lead. We have the much larger carbon footprint per capita,” Obama said at an expanded G8 summit in Italy. “And I know that in the past the United States has sometimes fallen short of meeting our responsibilities, …