Michael Crichton is a writer. He wrote Jurassic Park and Twister (among lots of others). He's not an ecologist, and nor is he an environmentalist. Still, he brings one of the sanest counter-arguments I've ever seen to the "Save the Planet" attitudes (in short, "stop thinking we understand what we're doing").
If you believe that the fact he's not working in these fields is the most important issue here, feel free to look up argumentum ad hominem.