National Geographic: Climate change has been the focus of much of the opposition to TransCanada's Keystone XL pipeline. But many conservationists are also concerned about more immediate environmental consequences.
They're worried about the pipeline construction's impact on wildlife and ecosystems, and of possible spills of the heavy crude oil that will flow through the pipeline at the rate of 830,000 barrels a day. (See related: "Interactive: Mapping the Flow of Tar Sands Oil.")
Some people, seeing a map of the...