What we are doing to the future of our children, and the other species on the planet, is a clear moral issue.

What has become clear from the science is that we cannot burn all of the fossil fuels without creating a very different planet.

Interference with communications of science to the public has been greater during the current administration than at any time in my career.

We are on the precipice of climate system tipping points beyond which there is no redemption.

The 5-year mean global temperature has been flat for the last decade, which we interpret as a combination of natural variability and a slow down in the growth rate of net climate forcing.

We cannot afford to put off change any longer. We have to get on a new path within this new administration. We have only four years left for Obama to set an example to the rest of the world. America must take the lead.

We have known since the 1800s that carbon dioxide traps heat in the atmosphere. The right amount keeps the climate conducive to human life.