Present simple passive
We send greenhouse gases into the atmosphere
Greenhouse gases are sent into the atmosphere by us
They closed two landfills last month.
Two landfills were closed last month.
Technology will stop the climate change
The climate change will be stopped by technology
They have already cut down the trees.
The trees have already been cut down.
Cows produce methan
Methan is produced by cows
People didn't reduce air pollution in 2023
Air pollution wasn't reduced in 2023
People will protect endangered animals
Animals will be protected by people
We haven't recycled the bottles yet.
The bottles haven't been recycled yet.
Greenhouse effect causes the global warming
Global warming is caused by the greenhouse effect
They didn't plant 500 trees last year.
500 trees weren't planted last year.
People won't pollute rivers in the future.
Rivers won't be polluted by people.
People haven't polluted the river
The river hasn't been polluted by people.