Copenhagen named "Green Capital of Europe"
Cycle superhighways, connected bins and smart traffic lights: Copenhagen is making every effort to go carbon neutral.
Pangolins under threat as illegal trafficking grows
Fire Drill Fridays, Jane Fonda's climate fight
Hanging bridges in Costa Rica's canopy
Two monarch butterfly advocates found dead in Mexico
The life of Boyan Slat, a young man who wants to clean the oceans
'Cocaine hippos' threaten ecosystems in Colombia