They can’t bear people living guilt-free lives.
Every now and then someone pipes up to point out that if environmentalists really want to lower carbon, they’re going to have nuclear. And they’re promptly buried in a tsunami of outrage (“Nuclear? Do you want us all to die?”) and spin (look at this blog post sponsored by a solar panel company about how well solar panels work). The obvious answer is that environmentalists, like all lefties, don’t actually care about the things that they claim to care about.
