Agence France-Presse: The United States and Britain insisted Monday they had not given up on securing a deal to tackle climate change at a crunch summit in December after a meeting of major polluting countries in London. British Climate Change Secretary Ed Miliband told reporters afterwards that “nobody was talking about plan B”, while the US special envoy for climate change Todd Stern insisted his country was “fully committed” to a deal. Earlier, British Prime Minister Gordon Brown warned that the …