So, the observation that the size and extent of a population can change over time, varying with climate and other conditions, is rather straightforward and uncontroversial. People who hate wolves and rats know that if they don't feed them, they'll go away. But if they leave sheep unattended in unfenced pastures, wolves will come. Populations of species of animals grow and shrink in response to the environment, as do trees and other plants. | So, the observation that the size and extent of a population can change over time, varying with climate and other conditions, is rather straightforward and uncontroversial. People who hate wolves and rats know that if they don't feed them, they'll go away. But if they leave sheep unattended in unfenced pastures, wolves will come. Populations of species of animals grow and shrink in response to the environment, as do trees and other plants. |