The rise of the ecologist almost exactly parallels the decline of the naturalist.

How far must suffering and misery go before we see that even in the day of vast cities and powerful machines, the good earth is our mother and that if we destroy her, we destroy ourselves?

It is the great destiny of human science, not to ease man's labors or prolong his life, noble as those ends may be nor to serve the ends of power, but to enable man to walk upright without fear in a world which he at length will understand and which is his home.

The rise of the ecologist almost exactly parallels the decline of the naturalist.