Today is Earth Day - the 46th Earth Day, to be exact. And in a moment, we'll hear how this observance got its name. First, how the White House is using this date to highlight threats posed by climate change. President Obama marked Earth Day with a visit to the Everglades.
PRESIDENT BARACK OBAMA: Part of the reason we're here is because climate change is threatening this treasure and the communities that depend on it, which includes almost all of South Florida. And if we don't act, there may not be an Everglades as we know it.