By Hannah Thomas-Peter, Sky Correspondent In Nebraska
The proposed Keystone XL oil pipeline is one of the most controversial projects on American soil, and a nasty headache for Barack Obama.
He must approve it because it runs across a national border, from Canada to oil refineries in Texas.
Say yes and critics will say he is breaking his pledge to combat climate change.
Say no and he will be accused of being anti-jobs, progress, and energy security.
His decision has been six years in the making, postponed multiple times.
Now Keystone XL symbolises the fight over America's energy future, at a time when oil prices have hit a two-year low, driven in part by a North American production boom.
Speaking at an anti-pipeline concert in Nebraska, musician Willie Nelson told Sky News: "I want the President to be watching what's going on here today, learn something, and do the right thing: stop the pipeline."
In part Mr Obama is waiting to see what happens in Nebraska before he makes a decision.
Although there are many who support the pipeline in this state, the anti-Keystone movement has forced a legal battle over the proposed route, stalling the whole process until the local courts make a decision.
Keystone XL would run for more than 1,000 miles, cutting through Nebraska's prime farmland.
Opponents say they oppose a foreign corporation building a pipe through their land.
Many worry that spills could threaten Nebraska's vast underground reservoir, and that the pipeline would increase global dependence on fossil fuels.
The company building the pipeline is Transcanada.
It says Keystone XL will be one of the safest ever built.
It has promised thousands of jobs, and changed its route to minimise impact on environmentally sensitive areas.
Transcanada's pipeline would start in the Alberta oil sands.
It is the third largest proven oil reserve in the world behind Saudi Arabia and Venezuela, producing almost two million barrels of oil every day.
Cenovus energy company spokesperson Al Reid took us on a guided tour of one of his oil extraction operations.
He said: "Before we even produce oil in Alberta at a facility like this, we go through a two to three-year regulatory process that looks at all the environmental and social aspects of what we're going to do."
But critics say the bitumen underground there is 'dirty' oil.
It needs heating to be extracted and transported which can emit more greenhouse gasses than with other similar fuels.
But a recent State Department report said that building Keystone XL would not have a significant impact on climate change, in part because oil sands development will happen anyway.
Heritage Foundation energy policy expert Nick Loris said: "It's a great idea.
"You have a pipeline that's bringing up to 830,000 barrels of oil a day and it's coming from a safe reliable trading partner.
"Because oil is a globally traded commodity, the more oil we put in the market, the better Americans will be whether that is exported or not."
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