Answers on a postcard....
A) No, it's not, but is it any less disturbing to the environment than coal mining, masses of wind turbines tearing up the countryside or damming rivers? Not even 'do nothing' costs nothing. If we don't do this, we lose 15 years, or more to the point face 15 more years deeper in the pockets of either those reputable nations in the middle east or Russia than we should be.
B) It buys you 15 years to build up alternatives, be they nuclear (the better option), or wind/water/etc.
C)See answer B. So long as 'single interest groups' (treehuggers and/or NIMBYs) and their lobbyists as well as those loveable bureaucrats don't balls it up. Which they will....