According to a blog comment - Teilhard de Chardin, from Future of Mankind(1955):
"The more we ponder these matters of the future the more must we realize that, scientifically speaking, the real difficulty presented by Man is not the problem of whether he is a center of constant progress: it is far more the question of how long this progress can continue, at the speed at which it is going, without Life blowing up upon itself or causing the earth on which it was horn [born?] to explode. Our modern world was created in less than 10,000 years, and in the past 200 years it has changed more than in all the preceding millennia. Have we ever thought of what our planet may be like, psychologically, in a million years’ time? It is finally the Utopians, not the ‘realists’, who make scientific sense. They at least, though their flights of fancy may cause us to smile, have a feeling for the true dimensions of the phenomenon of Man.