New York Times: China and India formally agreed Tuesday to join the international climate change agreemen reached last December in Copenhagen, the last two major economies to sign up. The two countries, among the largest and fastest-growing sources of greenhouse gas emissions in the world, submitted letters to the United Nations agreeing to be included on a list of countries covered by the so-called Copenhagen Accord, a three-page nonbinding statement reached at the end of the contentious and chaotic …