Obama: Climate Change May Lead to 'Irreversible Catastrophe'

U.S. President Barack Obama says inaction on climate change could leave future generations with an “irreversible catastrophe.”

Mr. Obama urged more than 90 global leaders gathered for a climate change summit in New York City to work together to combat the problem.

U.N. Secretary-General Ban Ki-moon called the summit, and opened the session Tuesday by saying it would be “morally inexcusable” not to act.