Reuters: Rejendra Pachauri said he thought he was "walking into the lion’s den" on Tuesday when he told oil executives they need to take a lead in cutting greenhouse gas emissions in order to save the Earth from the consequences of global warming. Pachauri, chairman of the U.N. Intergovernmental Panel on Climate Change that shared the 2007 Nobel Peace Prize with former U.S. Vice President Al Gore for work on climate change, said the oil industry has been both lion and lamb when it …