Humans are part of nature, part of the web of life. Whatever we do to the web, we do to ourselves; that's from Chief Seattle. We are changing the face of the planet by degrees every day with our use of land, water, and natural resources, including our means of travel, whether by land, sea or air. Similar to a beaver bringing logs to his dam and changing the flow of a river. People brought citrus to America and it became naturalized in FL. Now we inadvertently brought psillids and emerald ash borer to America, and will see the demise of citrus and ash trees. We will read about citrus and ash trees in the future like we read about the American chestnut now. The only hope for citrus will be genetic programs for resistance and/or immunity to greening like the American Chestnut Society is doing for chestnut blight.