Most environmental concern is BASED on the findings of science,
whereas lack of environmental concern is based on either ignorance or selfish greed.
Your statements and his are not mutually exclusive. The bulk of people who are environmentalists or who think climate change is bunk form their positions on these issues for philosophical or economic reasons, not rational reasons. I'm an engineer and I spend a lot of time "educating" them. If you don't know the difference between kilowatts and kilowatt-hours (as most of these people don't), you have no business trying to influence energy policy. It's completely obvious you're basing your opinion on things other than facts.
The environmental scientists who research this stuff do so with a fairly neutral approach. A lot of engineers are environmentally conscientious as well because it correlates with energy efficiency, and engineers love optimizing for efficiency. But they're realistic about it. That's why such a large segment of slashdot readers are both pro-environment and pro-nuclear. They're realistic enough to realize that although nuclear has its drawbacks, the drawbacks of opposing it resulting in continued use of coal and oil are much, much worse (because wind and solar technologies are not yet capable of taking over base load, and probably won't be for another 20 years). Go ahead. Ask anyone who's pro-solar how many square meters of solar panels they'll need on average to charge their EV every night (using batteries as interim storage). Most of them have no clue, and wouldn't even know how to start figuring it out. Heck, most of them don't even have the faintest concept of how big a solar panel it takes to light a light bulb. How can you compare a technology to alternatives and come to a decision to advocate it if you don't even understand these basic things?