Nations agree to start drafting climate action plans, which could encourage greater investment in clean energy.
The way the Land of the Rising Sun built and lost its dominance in photovoltaics shows just how vulnerable renewables remain to changing politics and national policies.
Severe droughts are forcing researchers to rethink how technology can increase the supply of fresh water.
Online courses may not be changing colleges as their boosters claimed they would, but they can prove valuable in surprising ways.
The first commercial power plant to use carbon capture and sequestration shows the potential of a crucial technology.
Equipment for making microchips has led to solar cells that are twice as efficient as conventional ones.
Hybrids are a much more cost-effective way to reduce carbon emissions than newly released hydrogen fuel cell cars.
Shanley Kane challenges the assumptions and practices of the tech industry.
Inexpensive oil could increase the pressure to reduce mandates for biofuels.
Millions of batteries discarded with computers have more than enough life to power home lighting for one year, researchers in India say.