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Solar Cells with LEDs Provide Inexpensive Lighting

(PhysOrg.com) -- Of the 1.5 billion people in developing countries who do not have electricity, many rely on kerosene lamps for light after the sun goes down. But now, researchers from Denmark have designed an LED lamp that ...

Forest clearances sealed ancient civilisation's downfall

(PhysOrg.com) -- An ancient South American civilisation which disappeared around 1,500 years ago helped to cause its own demise by damaging the fragile ecosystem that held it in place, a study has found.

Preparing for climate's impact on renewables

Reducing the impacts of climate change will require substantial investments in renewable energy sources. But climate change itself could affect those renewable alternatives: changing yields for biomass crops, reduced streamflow ...

Land deals meant to improve food security may have hurt

Large-scale land acquisitions by foreign investors, intended to improve global food security, had little to no benefit, increasing crop production in some areas while simultaneously threatening local food security in others, ...

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