Air surrounds the earth like a large envelope. People, plants, and animals need the clean air to live and survive. The air that surrounds our planet is affected by all the activities that take place on the earth. Once this air is fouled, there is no way for humans to replace it. The atmosphere protects us from harmful rays and heat of the sun.
Water is another renewable resource.
This equals about 30 billion gallons of fresh water a day. This is an average of 87 gallons per person a day. There is a limited amount of water available. Most of the water on the planet is salt water in the oceans. This water is too salty to drink or to use for farming.