Planetologist call it the conundrum of unforeseen ecological consequence. I call it the whack-a-mole rule of human meddling. She clasped both hands like a child hammering. WHACK! We change something here. Oops, that makes another problem pop up there where we didn't expect it. WHACK! So, we whack that mole. Oops! We're so smart that we're a menace.