Joule Unlimited is one of a handful of companies working to develop advanced biofuels that avoid harmful greenhouse gas emissions and eschew fossil fuels.
As Beijing signals a red alert over smog, concerns about air pollution are high -- but worries about climate change are significantly lower.
Christiana Figueres, the U.N. climate change chief since 2010, is tasked with persuading the world's leaders to tackle the climate crisis at COP21 in Paris this week.
The Colombian capital is at the forefront of a global effort by cities to transform their public transit systems into cleaner, more efficient networks.
Scientists and engineers around the world are working on nuclear fusion reactors that, if successful, could replace today's carbon-intensive power plants.