This just in, politicians make policy decisions for political reasons. Now we return you to your normally scheduled programming.
The environmental left (to be nice) tend to look at just about any type of economic development as bad for the environment and some type of giveaway to the wealthy. This is not a mainstream political view in America but like with the Republican Party and the christian right, the Democratic Party needs the environmental, really socialist, left to be successful politically, especially in mid-term elections. That was a big factor in the delay of the Keystone Pipeline by the White House.