Jan. 3 (UPI) -- A string of announcements about big investments in nuclear energy production signal a revival for the industry that already produces about 20% of U.S. electricity. Google , Microsoft and Amazon are among the technology companies looking to nuclear power to produce energy with a smaller carbon footprint. Environmental organizations remain skeptical, if not outright opposed to the use of nuclear energy. Advertisement Disasters at nuclear plants in Chernobyl in 1986 and the