​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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    How your daily coffee can help tropical forests grow back

    Researchers find that the coffee pulp is valuable in its own right.

    Credit: Rebecca Cole/British Ecological Society
  • When coffee is harvested, the skin and pulp surrounding the bean are often discarded.
  • Costa Rica, which had much of its tropical forests chopped down for agricultural use, is testing coffee pulp as a way to help reforest the country.
  • A new study finds that coffee pulp can help reforest land in just two years.
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    Nature-based Solutions (NbS) won't save the planet

    Their success is based on us adopting a plant-based diet, too.

    Credit: Dan Kitwood/Getty Images

    Natural ecosystems, such as forests, grasslands and oceans, do a pretty good job of storing carbon and supporting biodiversity.

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    Here's a 10-step plan to save our oceans

    By 2050, there may be more plastic than fish in the sea.

    Credit: Cameron Venti on Unsplash
    • 2050 is predicted to be a bleak milestone for the oceans - but it's not too late to avert disaster.
    • Here are 10 actions the world can take to strengthen and preserve our oceans for generations to come.
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    Why cities are critical to achieving a carbon-neutral world

    In May 2018, the city of Paris set an ambition to be carbon-neutral by 2050.

    Photo by Rodrigo Kugnharski on Unsplash
    • Countries, governments and companies are aligning on a need for net-zero - and this is an opportunity to rethink decarbonizing our cities.
    • There is no "one-size-fits-all" solution – each city's needs must be at the heart of developing integrated energy solutions.
    • A city can only decarbonize through collaboration between government, the private sector, and local communities.
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