The result of the US presidential election could mean an even greater fight for protesters fighting the Dakota Access Pipeline at Standing Rock.
While Standing Rock Sioux chairman David Archambault II said last month he was confident US President Barack Obama "would do the right thing" when it came to the pipeline, the new pro-oil President elect may not instil the same confidence.
Mr Obama has said he was interested in rerouting the pipeline to accommodate sacred lands.
"We're monitoring this closely, and I think as a general rule my view is that there is a way for us to accommodate sacred lands of Native Americans, and I think that right now the Army Corps is examining whether there are ways to reroute this pipeline," Mr Obama told NowThis.
Protesters near the Standing Rock Sioux reservation continue to fight completion of the $3.8 billion project, burying an oil pipeline deep below the Standing Rock Sioux tribe's prime water source.
Mr Trump has previously described climate change as "an expensive hoax" perpetrated by the Chinese, and has championed the proposed Keystone XL oil pipeline from Canda to the US.
Less than 12 hours after Mr Trump walked onto a New York City stage as the new President-elect, the stock price for Energy Transfer Equity, the company behind the proposed Dakota pipeline, rose 15 percent.
Kelcy Warren, chief executive officer of Energy Transfer Partners, said a Trump presidency would be a good thing.
"I view the results of last night's election as favourable not only for our project, but for future infrastructure projects that have been vetted and reviewed as thoroughly as ours has been," Mr Warren told Reuters on Wednesday.
Greenpeace spokeswoman Lilian Moline said the election result was "all the more reason for President Obama to step in immediately to stop the pipeline once and for all".
"There is no doubt that Donald Trump poses an immediate threat to our climate and will try to fast track this and other fossil fuel projects across the country," she said in a statement.