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"Photovoltaic solar panels actually start paying for themselves right after installation," says Buzard. He estimates 10 solar panels in 235-watt sizes cost about $14,000 installed; add in a 30 percent federal credit, register for renewable energy credits and you pay for the system in less than 10 years.

Those solar panels on top of your roof aren't just providing clean power; they are cooling your house, or your workplace, too, according to a team of researchers led by Jan Kleissl, a professor of environmental engineering at the UC San Diego Jacobs School of Engineering.

High-performance nanotech materials arrayed on a flat panel platform demonstrated seven to eight times higher efficiency than previous solar thermoelectric generators, opening up solar-thermal electric power conversion to a broad range of residential and industrial uses, a team of researchers from Boston College and MIT report in the journal Nature Materials.

Twenty former heads of state, including former US president Bill Clinton, warned Tuesday of an impending "water crisis" and agreed to establish a panel that will tackle a worldwide leadership gap on the issue.

While roofs across the world sport photovoltaic solar panels to convert sunlight into electricity, a Duke University engineer believes a novel hybrid system can wring even more useful energy out of the sun's rays.

Gary Chang, an architect, designed his 344 square foot apartment in Hong Kong to be able to change into 24 different designs, all by just sliding panels and walls. He calls this the "Domestic Transformer." Check out the video of Chang in his apartment below.

The authors of a recent Perspectives piece in the journal Nature Climate Science say it is not enough to intuit the success of climate communications. They contend the evaluation of climate communication should be met with the same rigor as climate science itself. Here, someone uses the 220 megapixel HiPerWall display at the University of California, San Diego to discuss 10 time varying Intergovernmental Panel on Climate Change simulation runs.

The health of the world's oceans is declining much faster than originally thought - under siege from pollution, overfishing and other man-made problems all at once - scientists say in a new report.

panel of marine scientists who met earlier this year in Oxford, England, have concluded that the world's oceans are facing an unprecedented loss of species. As the London Independent reports today, "The seas are degenerating far faster than anyone has predicted, the report says, because of the cumulative impact of a number of severe individual stresses, ranging from climate warming and sea-water acidification, to widespread chemical pollution and gross overfishing." They concluded that the negative impacts are greater than predicted, and that mass extinctions could occur within one human generation.

Bloomberg's office says the new initiatives include plans to build solar power plants on capped landfills and launch a loan program to help property owners pay for green energy efficiency upgrades.