Richmond Hill Prison on the Caribbean island of Grenada runs on biogas. A small generator on the prison farm provides enough of it to cook and bake with. It's a rehabilitation project that benefits the whole island.
Green energy and prisons aren't exactly two ideas that appear to fit naturally together. But inmates at a jail on the Caribbean island of Grenada are learning how to turn dung into energy as part of their rehabilitation.
Our oceans have become one massive rubbish dump. The waste, whether the size of a bus or a microorganism, is dangerous - and not only for marine life. But people are working to clear it up.
In some parts of the world, people have been killing manta and mobula rays to use their gills for a so-called medicine. But eating these animals is threatening the future of the species and could be hurting our health.
With the help of technology and a simple trick, marine biologists are aiming to find out both the number of sharks in the world's oceans and their influence on ecosystems.
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