Let's say we had a bad one, and all the plants and animals died, and the earth was clicking hot for a hundred thousand years. Life would survive somewhere-under the soil, or perhaps frozen in Arctic ice. And after all those years, when the planet was no longer inhospitable, life would again spread over the planet. The evolutionary process would begin again. It might take a few billion years for life to regain its present variety. And of course it would be very different from what it is now. But the earth would survive our folly. Life would survive our folly. Only we," Malcolm said, "think it wouldn't." Hammond said, "Well, if the ozone layer gets thinner-" "There will be more ultraviolet radiation reaching the surface. So what?" "Well. It'll cause skin cancer." Malcolm shook his head. "Ultraviolet radiation is good for life. It's powerful energy. It promotes mutation, change. Many forms of life will thrive with more UV radiation." "And many others will die out," Hammond said. Malcolm sighed. "You think this is the first time such a thing has happened? Don't you know about oxygen?" "I know it's necessary for life." "It is now," Malcolm said. "But oxygen is actually a metabolic poison. It's a corrosive gas, like fluorine, which is used to etch glass. And when oxygen was first produced as a waste product by certain plant cells-say, around three billion years ago-it created a crisis for all other life on our planet. Those plant cells were polluting the environment with a deadly poison. They were exhaling a lethal gas, and building up its concentration. A planet like Venus has less than one percent oxygen. On earth, the concentration of oxygen was going up rapidly-five, ten, eventually twenty-one percent! Earth had an atmosphere of pure poison! Incompatible with life!
( Michael Crichton )
[ Jurassic Park ]
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