1:28
Re-entering the agreement was among one of the first actions Biden signed upon arriving to the Oval Office.
![\"PHOTO:](\"http://a.abcnews.com/images/Politics/paris-cop21-eiffel-gty-ps-210126_1611671923129_hpEmbed_3x2_384.jpg\")
Environmental policy experts told ABC News last year that while the U.S. lost its standing as a climate leader under Trump, it would take more than simply reentering the global stage for it to regain that status -- that it would have to keep ambitious commitments for reducing its greenhouse gas outputs.
Construction on the TransCanada Corporation Keystone XL oil pipeline has halted after the permits were revoked by Biden during his first day in office.
The 1,700-mile project, slated to carry about 800,000 barrels of oil per day from Alberta to the Gulf Coast in Texas, was first proposed under President George W. Bush but was later stopped by the Obama administration, which cited potential pollution concerns.
One of Trump's first big moves as president was overturning Obama's decision and signing an executive order to approve the development, stating it would benefit the economy.
\"The Keystone XL pipeline disserves the U.S. national interest,\" the Biden executive order states. \"The United States and the world face a climate crisis. That crisis must be met with action on a scale and at a speed commensurate with the need to avoid setting the world on a dangerous, potentially catastrophic, climate trajectory.\"
The halt will eliminate more than 1,000 jobs in the upcoming weeks, said Keystone XL President Richard Prior.
![\"PHOTO:](\"http://a.abcnews.com/images/Politics/keystone-pipes-rt-ps-210126_1611670558550_hpMain_4x3t_384.jpg\")
On Monday, Canadian Prime Minister Justin Trudeau expressed \"disappointment\" over rescinding the permit during a call with Biden, according to the White House. Trudeau had previously announced his support of the project in 2018.
ABC News' Ben Gittleson, Sarah Kolinovsky and Christine Theodorou contributed to this report.
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