The issue is the percentage of Plutonium 240 and Plutonium 241 mixed in with Plutonium 239. Having too much Plutonium 240 and 241 means you will get a fizzle instead of a bomb. Enriching Uranium or Plutonium to weapons grade is extremely difficult.
2. Brave New Climate notes how climate change skeptics (or pro-climate change people) and anti-nuclear people are irrelevent to the global energy situation. The reason being is that the majority (80+5) of energy development is being done in China, India, Russia and other countries where climate change and anti-nuclear movements are irrelevant.