Describing as a ‘breakthrough’ the agreement on climate change reached by him with leaders of India and other emerging economies, US President Barack Obama today said in Washington that it lays the foundation of international actions to tackle global warming in the years to come.<br/><br/>In his first public statement on his return from Copenhagen Summit,Obama said ,for the first time in the history, all the major economies of world have come together to accept their responsibility to take action to confront the threat of climate change. <br/> <br/>This progress did not come easily and we know that progress on this particular aspect of climate change negotiations is not enough, he said referring to the Copenhagen accord reached by the US and BASIC countries in the final hour of the summit. He said, going forward we're going to have to build on the momentum that we established in Copenhagen to ensure that international action to significantly reduce emissions is sustained and sufficient over time.<br/><br/> <br/>