Question

45 multiple choice 1 point
how did governments collaborate to reduce environmental harm in the 1990s?
they joined protocols to limit the destruction of the ozone layer.
they provided funds to brazil to prevent the destruction of the amazon rainforest.
they sent un troops to stop acts of environmental terrorism.
they signed treaties to stop offshore fisheries.

Explanation:

In the 1990s, a major global environmental collaboration was the expansion and implementation of protocols targeting ozone layer destruction, most notably the 1990 amendments to the Montreal Protocol. The other options are incorrect: large-scale international funding for the Amazon in this context was not a defining 1990s collaborative action, UN troops were not deployed for "environmental terrorism" in this decade, and there were no global treaties to fully stop offshore fisheries.

Answer:

They joined protocols to limit the destruction of the ozone layer.