What is a major problem with the timber industry?

What is one problem with mining?

The first Canadian-American plan to clean the Great Lakes was to reduce which chemical?

What is the government doing to help with the timber problems in Canada?

Which people are likely to be against the Great lakes Water Quality Treatment Agreement?

Why does the Canadian-American government have to work with the U.S. governmetn to clean up the Great Lakes?

Rain mixes with which substances to become acidic?

Where in Canada are the most valuable minerals found?

Which are sources of chemicals in acid rain?

What is slag?

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