Incredibly valuable infrastructure.
Nice illustration.
Beyond the short term environmental impact there is also a tremendous economic impact that reaches throughout many sectors of the economy. For example, the steel pipe is manufactured then railed and trucked to several staging points along the pipelines route.
Access matting, typically made out of lumber is manufactured somewhere in North America and then trucked to the site. This lumber may be bought and sold by lumber brokers(like me)that supply the lumber to the access manufacturer.
The construction company may purchase new heavy equipment built by companies like Caterpiller, John Deere, etc.
Locally, workers may stay in hotels, motels and buy food in area grocery stores, sub shops, cafes, bars, etc. They will buy gasoline & diesel fuel. They will buy survey stakes.
The NIMBY effect always fails to recognize these impacts.