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The tiles of Langelands Square, in the Frederiksberg district of the Danish capital, have a special coating that helps absorb nitrogen dioxide (NO2).
Luxembourg recently became the first country to make public transport free. But pioneers Tallinn have been doing it for years.
The population is doing well, they're no longer threatened by poachers in the country's forests.
Talk about leading by example!
Should Paris pull the plug on heating outdoor terraces?
It's not as super as Super Tuesday, but 352 delegates are up for grabs as Biden and Sanders do battle.
Six weeks on from the lockdown of Wuhan, China, many are still stranded and wish their governments had done more.
The 250-strong village produces no carbon on a daily basis, with residents living entirely sustainably.