The United States could dramatically reduce its carbon emissions per kilowatt-hour without raising its overall energy bill.

The world beyond 450 ppm atmospheric concentrations of carbon dioxide, the world that crosses carbon cycle tipping points that quickly take us to 1000 ppm, is a world not merely of endless regional resource wars around the globe. It is a world with dozens of Darfurs. It is a world of a hundred Katrinas, of countless environmental refugees

The science is crystal clear: we humans are the primary cause of global warming, and we face a bleak future if we fail to act quickly.

The last time Earth was 1°C warmer than today, sea levels were 20 feet higher.

We created a way of raising standards of living that we can't possibly pass on to our children.

When people ask me what they should do, I reply, "Get informed, get outraged, and then get political."

The United States could dramatically reduce its carbon emissions per kilowatt-hour without raising its overall energy bill.