US President Donald Trump on Tuesday signed an executive order to revive controversial Keystone XL and Dakota Access oil pipelines.
Trump told reporters that the US "are going to renegotiate some of the terms" of the Keystone XL project.
The Dakota pipeline would be "subject to terms and conditions negotiated by us", he said.
Both projects were blocked by the Obama administration due in part to environmental concerns.
The Keystone XL project was rejected by former President Barack Obama in November 2015 because Democrats and environmental groups complained it could worsen climate change by enabling further growth from oil sands, which created higher greenhouse gas emissions than some other forms of production.
The project, worth $8 billion, was proposed to go from Canada through the US state of Montana and South Dakota to Nebraska, where it would connect with existing pipelines to carry more than 800,000 barrels of crude oil a day to refineries along the US Gulf Coast.
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