Agriculture affects the enviornment by using up nutrients in the soil. When Farmers plant on the same plot of land again and again, the nutrients that were/are in the soil are eroded and weathered away. It makes it harder for plants to grow without the nutrients and that means more Carbon Dioxide in the air and less Oxygen for us to breathe with.
Of course, that's only if humans plant the agriculture. If it's naturally growing there by itself it generally doesn't affect the enviornment..
Of course, that's only if humans plant the agriculture. If it's naturally growing there by itself it generally doesn't affect the enviornment..