A reader writes:
You fell for a sleight of hand with your headline on the possible breakthrough in controlled fusion. The "clean" implies that there are not any dirty radioactive isotopes being used or being produced as with nuclear fission reactors. In principle, nuclear fusion could be a radioisotope free process but the one using deuterium-tritium pellets is definitely not -- tritium is radioactive.
This is too bad. I happen to support nuclear power but I do not think these DOE PR flacks are doing any service over-selling this technology. Should these current experiments work, and some serious pilot projects begin, people will wake up and realize that the cleanliness has been over sold. The anti-nuclear crowd will have a field day with this. This objection to calling the deuterium-tritium pellet technology "clean" has been raised by physicists at the Livermore labs for the last 20 years, though I have not seen it publicly discussed.