Associated Press: President Barack Obama is preparing to unveil his long-awaited national plan to combat climate change in a major speech, he announced on Saturday.
"There's no single step that can reverse the effects of climate change," Obama said in an online video released by the White House. "But when it comes to the world we leave our children, we owe it to them to do what we can."
People consulting with White House officials on Obama's plan, to be unveiled Tuesday at Georgetown University, say they expect...