"Evolution, if it is nothing else, is endless modification, change without reason or end. Notions of preserving racial purity in the twenty-first century, or of maintaining biologically static environments, in which all new arrivals are classified as "invasive" or "foreign" and are to be expunged, or are not permitted entry to start with, are untenable. The obvious ethical issues aside, these arguments deny the flow of time. Landscapes are figuratively, not actually, timeless. And ours is an age of unprecedented cultural exchange, of emigration and immigration. Reactionary resentment around issues of race and culture has no future but warfare."