SAM AVERY, a long-time American social activist, claims Canada’s oil-sands extraction will double atmospheric carbon dioxide, setting the planet on a dangerous climate course. His new book, The Pipeline and the Paradigm: Keystone XL, Tar Sands, and the Battle to Defuse the Carbon Bomb, frames opposition to the proposed Keystone XL pipeline from Alberta to Port Harding, Texas, as the most critical environmental cause of our time.
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