Air pollution in US and Canadian cities is caused mostly by .
A.
clear-cutting forests for ti...
Social Studies, 24.01.2021 21:00 fatimalandau54
Air pollution in US and Canadian cities is caused mostly by .
A.
clear-cutting forests for timber
B.
releasing emissions from vehicles and industry
C.
dumping runoff from farms into rivers
D.
harvesting minerals from mines
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