Both proponents and critics of TransCanada's Keystone XL pipeline agree that President Barack Obama should decide already on the project. "I, for one, simply don't understand why we haven't built it yet," said Rep. Michael Burgess, R-Texas. "If the president were to become the first world leader to block a big energy project on the grounds of its effects on climate, it might help dramatically reset the international negotiations" on climate change, wrote environmental activist Bill McKibben.

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