As we just heard, tomorrow, the Environmental Protection Agency will announce new regulations aimed at cutting carbon pollution. To hear more about that, we're joined by Michael Oppenheimer. He's a professor of geosciences and international affairs at Princeton University. These regulations are the president's most ambitious plan yet to combat climate change. Professor Oppenheimer, from your vantage point, how significant is this announcement?
This is WEEKEND EDITION from NPR News. I'm Rachel Martin. President Obama wrapped up a big week full of highs and lows - from his foreign policy speech at West Point to the resignation of VA secretary Eric Shinseki, and the news that the sole American POW from the Afghan war has been released.