What has the Colorado River become an environmental issue?(1 point) Responses River levels are rising rapidly as a result of climate change. River levels are rising rapidly as a result of climate change. Irrigation has severely reduced the flow of water. Irrigation has severely reduced the flow of water. Oil spills have polluted the river and threatened many species. Oil spills have polluted the river and threatened many species. Frequent flooding threatens endangered habitats in the Rocky Mountains.
