Question

what was the main argument against the xl keystone pipeline?
it would lead to deforestation
it would encourage the production and use of oil, worsening climate change
it would harm wildlife habitats
it would increase oil prices

Explanation:

The Keystone XL Pipeline was a proposed project to transport crude oil. One of the main concerns was its environmental impact. The argument against it centered on the fact that it would encourage the production and use of oil. Oil is a fossil fuel, and its extraction, production, and combustion release greenhouse gases like carbon dioxide. These gases contribute to climate change by trapping heat in the Earth's atmosphere. While other options like deforestation (which could be a side - effect but not the main argument), harm to wildlife habitats (a possible local impact but not the overarching concern), and increasing oil prices (not a major environmental or climate - related argument) were also considerations, the most significant and overarching argument was related to climate change.

Answer:

It would encourage the production and use of oil, worsening climate change.