Most of the claims Crichton makes here are disputable at best, dead wrong in many cases. He's obviously cherrypicked his findings to suit his own goals here, something he claims to be against. Somehow he expects people to follow a rule that he himself is incapable of following.
For instance on DDT: it is still manufactured and used in many third-world nations around the world. It was banned in the U.S. not only as a suspected carcinogen, but for causing a whole slew of environmental and
health problems.