What is the conclusion of the human impact? give me at least 3 sentences.

Human impact on the environment or anthropogenic impact on the environment includes impacts on biophysical environments, biodiversity, and other resources. The term anthropogenic designates an effect or object resulting from human activity. humans poluute,make things that damage the ozone layer. Deforestation has become a huge concern for a wile, we over populate the earth and we change the Environmental behavior because the floods and dams we create.

so: 
Humans have a gigantic impact on the world for several reasons, such as; Pollution, deforestation,dams and over population. We deforest the rainforest and create a desert, or desertification , we overpopulate the world, causing a wide spread of pollution;oils,smoke,gases etc.,build dams and change the course of nature, and we alter the ozone layer,creating global warming. Humans have a bigger impact on the world than you might think. 

The answer is that they are composed mostly of liquid water.