I think these graphs speak for themselves:
...the pipeline expansion would completely undermine not just B.C.'s emissions reduction policy, but the entire country's emissions reduction policy.
The second graph shows the estimated gap (i.e. necessary reductions) between the most recent national emissions estimate (2010, 692 Mt) and the policy goal for 2020 (17% reduction, ~607 Mt). The emissions embedded in the proposed Northern Gateway pipeline (82.5 Mt) is alone almost as great as the Canadian 2020 emissions gap (85.3 Mt). Add in the original Kinder Morgan proposal, the recent proposed bump in capacity, and the emissions embedded in oil exports of the pipeline would be 1.6 times the national emissions gap.
So the Harper government's policy re Northern Gateway undermines its (stated) policy on emissions.