The Earth is getting warmer, and the level of co in the atmosphere is rising. At Mauna Loa in Hawaii, t levels of CO in the atmosphere have increased from 315 parts per million (ppm) in 1958 to 380 ppm today. And the increase of CO, is getting larger each year. In 1975, we put 4 gigatonnes of carbon into the atmosphere (a gigatonne is a billion tonnes). In 2008, we put more than 7 gigatonnes of carbon into the atmosphere. Where does it all go? Life on Earth needs carbon. There is carbon in the aiE, the sea, and the ground. When we burn coal and oil, we put carbon back into the air as carbon dioxide. When we