List 3 major environmental concerns in canada

Environment Canada has singled out air pollution as a major concern as it affects wildlife, vegetation, soil and water. The government agency has said air pollution from urban areas causes acid rain and contributes to climate change.

Explanation:

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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the 4th option is the answer