The detrimental effects of deforestation on forests and the ecosystem are the paragraph's main idea. Facts like the percentage of Earth's forest cover and its pace of decline are used by the author to develop this idea. They also discuss the two primary causes of deforestation, with an emphasis on the former: naturally occurring tree loss and human-caused deforestation. The author goes into further detail on the causes of deforestation, highlighting its financial advantages, but she comes to the conclusion that it has to end since it is vital for people, animals, and the ecosystem.

The paragraph discusses the detrimental effects of deforestation on forests and the ecosystem as its main idea. It provides facts about the percentage of Earth's forest cover and its decline to support this idea. The paragraph also mentions the two primary causes of deforestation, with a focus on human-caused deforestation. The author further elaborates on the causes, emphasizing the financial benefits but ultimately concludes that deforestation must end for the well-being of people, animals, and the ecosystem.