​This zero-energy 'daylight harvesting' device can send sunlight underground

Researchers in Singapore invented a novel device that may help the island nation illuminate its growing underground infrastructure.

Goela et al.
  • The device consists of an acrylic ball that absorbs and concentrates sunlight.
  • Under the ball is an optical fibre that transports the sunlight up to two stories underground.
  • The study found that the device's luminous efficacy rating was more than double that of commercially available LED bulbs.
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    Capsaicin, the chemical in spicy peppers, used to boost solar cell performance

    Can biomaterials help finally thrust perovskite solar cells to mainstream adoption?

    Credit: Pixabay
    • Perovskite solar cells are an emerging type of solar technology that's more efficient than current photovoltaic technologies, but hasn't yet been adopted due to problems related to cost and stability.
    • In a recent study, scientists treated perovskite solar cells with small amounts of capsaicin, finding that the compound improved both stability and efficiency.
    • In 2022, a British startup plans to bring perovskite solar cells to market for the first time.
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    Harvard scientists advance controversial plan to dim sunlight

    Researchers from Harvard receive permission for a test that may help cool Earth and fight global warming.

    Credit: SCoPEx
    • Swedish space agency allows Harvard researchers to test a stratospheric balloon next year.
    • The balloon may eventually be used to release particles into the atmosphere to reflect sunlight.
    • The goal would be to cool Earth and fight back against global warming but the approach has critics.
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    Credit: beysim via AdobeStock
    • The International Energy Agency is an intergovernmental organization that advises member nations on issues related to energy and the environment.
    • In its annual report, the IEA reported that the cost of solar is dropping more rapidly than previously thought, providing some parts of the world with historically cheap electricity.
    • The IEA predicted that, over the next decade, renewables will meet 80 percent of global electricity demand growth, while the demand for oil will peak.
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    These countries are leading the transition to sustainable energy

    Sweden tops the ranking for the third year in a row.

    AXEL SCHMIDT/DDP/AFP via Getty Images

    What does COVID-19 mean for the energy transition? While lockdowns have caused a temporary fall in CO2 emissions, the pandemic risks derailing recent progress in addressing the world's energy challenges.

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