John Hale, more commonly known as “Reverend Hale” was the Puritan pastor of Beverly Massachusetts, during the Salem witch trials in 1692. He was one of the most prominent and influential ministers associated with the witch trials, being noted as having initially supported the trials and then changing his mind and publishing a critique of them. He was born June 3, 1636 and died May 15, 1700.
Supply refers to the number of goods that are available. Demand refers to how many people want those goods. When the supply of a product ascends, the price of a product descends, and demand for the product can rise because it costs less. At some point, too much of a demand for the product will cause the supply to lessen. A fundamental economic principle that when supply exceeds demand for a good or service, prices fall. When demand surpasses supply, prices tend to rise. There is a flip-side relationship between the supplies and prices of goods and services when demand is not changed.
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I believe that the message the author is trying to convey in this excerpt is that humans need to take action to end further destruction of the natural environment, because if they don't, more and more species will disappear.