Age: TONY Blair is to lead an international team to tackle the problem of securing a global deal on climate change that would have the backing of China and the US. The former British prime minister believes he can help prepare a blueprint for an agreement to cut carbon emissions by 50% by 2050 – and he has the backing of the White House, the United Nations and Europe. He had been working on the project with a group of climate change experts since he left office last year, he said, …