It's hard to compare.
The U.S. has been able to outsource their most offending types of industries to 3rd world countries. Are they actually creating less pollution, or is it just in other people's yards now?
Canada on the other hand, is mainly a natural resource producing and refining country. It's really hard to sweep that under the rug for some very obvious and practical reasons.
Still, I hope the current government does everything they can to improve things.
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