Guardian: Today, President Obama will host the first state visit of his presidency, rolling out the red carpet for Prime Minister Manmohan Singh of India. Climate change will be high on the agenda for the leaders of the world’s two biggest democracies. And the timing is auspicious, coming only two weeks before the start of the high stakes global climate summit in Copenhagen. With some trying to dampen expectations that the world will seal a new climate agreement in the Danish capital, a …