From The China Study by T. Colin Campbell, pp. 346-347:
"Never before have we affected the natural environment to such an extent that we are losing our topsoil, our massive North American aquifers, and our world's rainforests. We are changing our climate so rapidly that many of the world's best-informed scientists fear the future. Never before have we been eliminating plant and animal species from the face of the earth as we are doing now. Never before have we introduced, on such a large scale, genetically altered varieties of plants into the environment without knowing what the repercussions will be. All of these changes in our environment are strongly affected by what we choose to eat."