As soon as the lagoon is frozen and the ice is hard, sailors take to their boots. In brilliant sunshine at subzero temperatures, historic ice yachters race across the frozen water at over 50 kilometers per hour!
In this edition, we sail to Hawaii's coral reefs, swim with sharks in South Africa, test the thickness of the sea ice in Arctic Canada and talk to Susan Avery, renowned scientist and expert on the ocean.
Satellite data indicates the Arctic is facing a decline in sea ice that could equal or even beat the negative record of 2012.
An international tribunal has ruled that Russia must pay millions in damages to the Netherlands for seizing a Greenpeace icebreaker in 2013. Russian officials had also detained activists aboard the Dutch-flagged ship.
Guanabara Bay in Rio de Janeiro is a dumping ground for sewage, trash and heavy metals. It's also where the Olympic sailing competitions will be held. Athletes and residents are worried about possible health impacts.
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