"Human beings and the natural world are
on a collision course. Human activities inflict harsh and often
irreversible damage on the environment and on critical resources.
If not checked, many of our current practices put at serious risk
the future that we wish for human society and the plant and animal
kingdoms, and may so alter the living world that it will be unable
to sustain life in the manner that we know. Fundamental changes
are urgent if we are to avoid the collision our present course
will bring about.
We the undersigned, senior members of the world's
scientific community, hereby warn all humanity of what lies ahead.
A great change in our stewardship of the earth and the life on
it is required if vast human misery is to be avoided and our global
home on this planet is not to be irretrievably mutilated."
11-18-1992, Union of Concerned Scientists