The issue of whether human activity is changing the climate is settled, the president said.

In a speech in Anchorage, Alaska, on Monday President Barack Obama warned that if nations do not act to stop climate change “we will condemn our children to a planet beyond their capacity to repair.”

“Climate change is no longer some far-off problem,” Obama said.” It is happening here. It is happening now. Climate change is already disrupting our agriculture and ecosystems, our water and food supplies, our energy, our infrastructure, human health, human safety–now. Today.”

“If we were to abandon our course of action, if we stop trying to build a clean-energy economy and reduce carbon pollution, if we do nothing to keep the glaciers from melting faster, and oceans from rising faster, and forests from burning faster, and storms from growing stronger, we will condemn our children to a planet beyond their capacity to repair,” he said.