“There is a man sitting in that house right now who is not going to stand for anyone other than himself,” Eryn Wise, a member of the Jicarilla Apache Nation and an organizer for Honor the Earth, told the crowd. “There is a man sitting in that house who has laughed in the face of women, who has laughed in the face of Muslim Americans, who has laughed in the face of immigrants, who has laughed in the face of indigenous people.”

The protesters chanted: “We are not going away! Welcome to your fourth day!” The cheer echoed off the U.S. Treasury Building.

It is indeed interesting that, on his fourth day, the new president would choose to move forward on the Keystone XL and Dakota Access pipelines. According to the Dallas Morning News, Trump may own as much as a $1 million stake in the parent company of Dakota Access, Energy Transfer Partners, and its CEO also donated more than $165,000 to his campaign. (Trump has said he sold all his stocks in June 2016, but he has offered no proof of this.)

It is interesting for other reasons, too. In many ways, the two pipelines can be seen as mirror images of each other.

At this point, the Keystone XL exists more as an idea than as steel-and-nails infrastructure. Almost a decade ago, the TransCanada Corporation proposed Keystone XL as a 1,200-mile pipeline connecting the oil fields of Alberta to the refineries of Nebraska, and the company began the approval process for the international project.

In 2011, climate activists picked up on Keystone XL. Bill McKibben, a prominent activist and journalist, announced that approval of the pipeline would be “game over” for the planet, as it would open up previously inaccessible oil in the Alberta tar sands for burning. He and other activists successfully turned the idea of Keystone into a rallying point for the larger cause of fighting climate change. What was at stake, they insisted, was not the fact of the pipeline itself, but the continued commitment of U.S. dollars to fossil-fuel infrastructure.

It worked. People rallied against Keystone, insisting on its significance as a symbol even if they admitted its emissions might be insignificant. They discovered, too, that the Democratic Party had a political lever over the project: Because the Keystone would be an international pipeline, it required approval from the U.S. State Department—and, thus, from the Obama administration.

A newfound army of climate activists demanded that Obama reject the pipeline and finally take climate change seriously. In November 2015, the president did. The State Department announced that, as Keystone would not lower oil prices or create jobs, it did not believe the pipeline was in “the national interest.” Keystone XL was dead. Until Tuesday.