In groups, portuguese students created kahoot games on the environment-related issues. They obviously played each other's games as well. Why don't give them a try?
ENVIRONMENTAL PROBLEMS
https://play.kahoot.it/#/k/f7f453de-8f3d-4b3c-aeab-2fcda601c1e5
THE BLUE WHALE
https://play.kahoot.it/#/k/5d2a25f4-8aea-489e-bc0e-b5e9109a92ca
https://play.kahoot.it/#/k/44654aa0-2e09-4475-a1f1-2ba4311feb97
ENDANGERED ANIMALS
https://play.kahoot.it/#/k/72fbe4f6-d94f-40f2-9b99-96bdca22466f
https://play.kahoot.it/#/k/9afbe15f-135d-4941-b313-2267ace619ff
https://play.kahoot.it/#/k/d32a7716-398d-4f86-894e-f3431851d4c7
WATER POLLUTION
https://play.kahoot.it/#/k/9568c04f-f6ca-44c8-b3a2-368d27e5b58c