The causes of global warming comes from humans, such as transport. Division industrial combustion and therefore we must help maintain the balance of the environment before the world does not have to stay.
The cause of global warming from man-made such as transportation division of combustion from industry and logging, so we must help maintain the balance of the environment before the world does not exist.
Causes of global warming from the work of humans, such as transport, burning from the food industry and cut wood, so we must keep the balance of the environment before the world.