President Barack Obama used his second inaugural address to put the divisive issues of climate change and immigration back on the front burner.

But according to a new national survey, Americans are divided over whether global warming is a man made phenomenon.

According to the poll, which was conducted last week, 49% agree with the White House that global warming is a proven fact and is due to emissions from cars, power plants and factories. That's twice as high as the number who say that global warming has not been proven, as well as the 24% who say that it is a proven fact but is not due to manmade sources. But the 49% figure is down seven points from 2007.

The president also used his speech to highlight the controversial issue of illegal immigration, and a CNN/ORC International survey released Tuesday also indicates that a bare majority of the public says the main focus of the federal government should be on developing a plan that would allow undocumented immigrants to become legal residents, rather than deporting them.