The problem with plastic water bottles is when we throw it away and it goes in the trash can, then the garbage truck picks it up and throws it in a landfill. While it sits in the landfill the sun rays hit it and makes C02 go out into the earths atmosphere. Then the atmosphere disperses it back down to the ocean. This causes the coral to die. Coral is very important to find out more about why this is important click any of the links below...