On President Biden’s first day in office, he revokes the construction permit for the Keystone XL pipeline, which has been mired in controversy since it was proposed more than a decade ago. The $9 billion pipeline was expected to carry crude oil from Alberta, Canada, to the Gulf Coast in the United States. Supporters touted its economic benefits and as a way of shoring up the U.S. oil supply. Environmental advocates warned the pipeline could harm the areas it passes through and deepen the country’s reliance on fossil fuels.