Life upon Earth spent the first 3,000,000,000 (3 billion) years hiding in the ocean, but when the Earth had formed an ozone layer, creatures were shielded from the suns ultraviolet light and therefore able to come upon onto land and start evolving new adaptations. When scientists first started noticing depletion in the Earth’s ozone layer, not much was done to combat the effects because the public and politicians in power did not understand the concept of chlorofluorocarbons, an invisible gas, w...
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