John Hawkins of Right Wing News has published numerous quotes by the ecological predecessors of Al Gore. Here are samples, one from each of Hawkins' categories:
Al Gore's Family Tree
We have wished, we ecofreaks, for a disaster or for a social change to come and bomb us into Stone Age, where we might live like Indians in our valley, with our localism, our appropriate technology, our gardens, our homemade religion -- guilt-free at last! -- Stewart Brand (writing in the Whole Earth Catalogue
Human beings, as a species, have no more value than slugs. -- John Davis, editor of Earth First! Journal
To feed a starving child is to exacerbate the world population problem -- Lamont Cole
This cooling has already killed hundreds of thousands of people. If it continues and no strong action is taken, it will cause world famine, world chaos and world war, and this could all come about before the year 2000. -- Lowell Ponte "The Cooling", 1976
Hawkins cites many, many more.
For several decades, true environmental concern has been co-opted by those with another agenda. Small wonder they are labeled 'watermelons'; green on the outside, but Red to the core.