into the land, plants, or trees. The other 45 per cent goes into the atmosphere and it stays there for a long time But why is the level of CO2 increasing? We burn coal and oil to make energy for our factories, offices, and homes, and for our cars, trains, and planes his makes about 75 per cent of the carbon that goes into the atmosphere. The other 25 per cent comes from the land. Everywhere in the world, people are building houses offices, and roads, and cutting down plants and trees. And when plants and trees die, their carbon goes back into the atmosphere. This is where the carbon cones from. But who is putting it there? Each person on Earth puts 4,600 kilos of CO, (or about 1,250 kilos of carbon) into the atmosphere each year