The issue focused on by the UK's leading scientists is "how to deal with the biosphere in the face of climate change", the UK's Green Party has said.The party's leader, Natalie Bennett, said the issue was "perilous" and "the old threat of global warming is now over".The paper that caused the most controversy was the paper that claimed in September that all available evidence suggested that human activity was the main cause of global warming.The paper's author, Prof William Schmitt,