“减轻地球的负担”用英语怎么说

relieve/reduce/ease/lighten the burden of the earth.

take the burden off the earth.

unburden the earth也可以。

最简单的三个单词就解决：
unburden the earth

to lighten burden on the Earth

lighten the Earth's burden

reduce the earth's burden
也可以用decrease

relieve the burden of the Earth