USA Today: President Obama’s remarks at the United Nations Climate Change Summit on Wednesday, as released by the White House: Good morning. I want to thank the Secretary General for organizing this summit, and all the leaders who are participating. That so many of us are here today is a recognition that the threat from climate change is serious, it is urgent, and it is growing. Our generation’s response to this challenge will be judged by history, for if we fail to meet it — boldly, …