AP Photo

It is highly unusual for an American envoy to give interviews interpreting and parsing the meaning of a U.S. president's speech. David Jacobson wouldn't have done that without clearance from the White House. Jacobson was explaining Barack Obama's many references to climate change in his State of the Union address on Tuesday, and the unstated connection to the Keystone XL pipeline project, from Alberta to the Gulf Coast of Texas. This isn't about the pipeline, it's about the Alberta oilsands, and greenhouse-gas emissions from bitumen. It's about environmental activists in the U.S. making Keystone their line in the sand on climate change. Thousands are expected to demonstrate at the White House on Sunday. Obama has a decision to make — to approve or not to approve Keystone....