Redefining "renewable energy" is vital for protecting forests, communities and climate.

COP18 demonstrated that we can no longer put our faith in politicians to make the tough decisions we need to avert catastrophic climate change. They have ignored the greatest challenge we face in the world today.

Developed countries say that plans to combat climate change won't be effective unless emerging economies like India and China reduce their growing emissions.

Global climate negotiations in Doha are nearing their conclusion and the talks are, as ever, beset by myriad divisions between rich nations and poor ones, between established economies and up-and-comers, and between, well, the United States and just about everyone else.

I'm referring to the CO₂ cap-and-trade allowance auction held by the State of California. The fact that the auction ran smoothly and compliance entities and others put their money down is one important step in establishing the program's credibility.

The high-level portion of the COP begins today. Youth -- half the worlds' population -- must wait outside the negotiating rooms to see what future reality awaits them.

Certain world leaders have buried their heads in the sand for years on this issue, seeking to stay competitive with emerging manufacturing markets. But history will not be kind to those who think they can watch and wait. One day they may call this period the second "Black Death."

Right now, Obama's legacy and America's future are on the line. I believed the president in 2008 when he told us that generations would look back and say "this was the moment when the rise of the oceans began to slow and our planet began to heal."

Within twenty years, when the baby is grown into an adult, the glacial ice of the high Arctic will have largely disappeared. The baby has been nurtured but have we abandoned any notion of care for its habitat?

Last week, the World Bank issued a report suggesting that a temperature rise of more than 4 degrees Celsius (7.2 degrees Fahrenheit) by 2100 could cause widespread crop failures, malnutrition and significant sea-level rise.

DOHA, Qatar (AP) — The United Nations climate chief is urging people not to look solely to their governments to make tough decisions to slow global ...

Qatar and its people are going to be so important in coming days being the host of COP18: The UN Climate Change Conference beginning today until Dec. ...

The world needs the investor community to make smart and ethical investments. We need win-win investments that tackle global poverty and inequity at the same time as ending the threat of runaway climate change.