Danish TV had a documentary about the nuclear opposition in the country in the 60s and 70s. One of the most interesting lines is pretty much a throwaway line by one of the former activists. The interviewer remarks that it's a little strange to be anti-nuclear, when the alternative is burning fossil fuel and the activist interjects with "But we didn't believe/understand that the alternative was coal and oil, we thought it would be solar and wind". That was never going to work, nuclear power was available as an option, wind turbines and solar cells where never going to be able to fulfill the energy requirement at the time, certainly not at a price the country could afford.

To me that really highlighted the naivety of many environmental activists. They mean well and we need them, but they so often fail to look at the problems holistically and zooms in on single issues.