New York Times: Senator Lindsey Graham, Republican of South Carolina, who has long resisted climate change legislation, has joined the ranks of those pushing for a bipartisan agreement to limit greenhouse gas emissions. We welcome his change of heart. Mr. Graham has sensibly decided that it helps neither the planet, the country nor his party to block efforts to solve the problem of global warming. Mr. Graham has held extensive conversations in recent weeks with Senator John Kerry, one of the main …