A. Climate change is a major environmental issue facing both the U.S. and Canada.
The major environmental issue facing the U.S. and Canada among the given options is A. climate change. Climate change refers to long-term shifts in weather patterns and temperatures, primarily caused by human activities such as burning fossil fuels and deforestation, leading to increased levels of greenhouse gases in the atmosphere. To determine the correct answer, you can analyze each option and understand its relevance to the environmental issues faced by the U.S. and Canada. In this case, climate change directly relates to environmental concerns, as it has widespread impacts on ecosystems, natural resources, and human populations.
