In the case of R v Crown Zellerbach, what was the main issue being addressed?

The case of R v Crown Zellerbach primarily dealt with marine pollution, specifically focusing on the federal government's powers to regulate environmental issues in navigable waters. The Supreme Court of Canada examined the scope of the federal government’s authority under the Constitution, particularly concerning the regulation of pollution in these waters under its jurisdiction.

The decision highlighted the balance between federal and provincial powers, as the provinces typically have jurisdiction over resource management, but the federal government can intervene to protect navigable waters from environmental harm. The landmark ruling established the principle that the federal government could enact laws to prevent and regulate marine pollution, thereby reinforcing its authority to ensure the integrity of navigable waters across Canada.

The relevance of this case extends beyond just marine pollution, as it underscores the broader constitutional framework regarding environmental protection and the distribution of powers between levels of government.