Environmentalists who favor nuclear energy 

The Criticism section begins with the introductory statement that some environmentalists favor nuclear energy and criticize opponents.  The body of the section lists examples, such as James Lovelock, Patrick Moore, and Stewart Brand.  An editor has questioned whether they are really environmentalists.  This is a fair question, since many people call themselves environmentalists with no apparent qualifications.  These three individuals, in contrast, have spent their lives researching environmental problems and educating the public about them.  If the term environmentalist doesn't apply to them then it doesn't apply to anyone.