The climate of the earth is always changing. In the past it has changed through causes, such as eruptions and the activities of the . We are currently in a warm period but since the 1850's the temperature has been far more than it should do naturally. The 1850's saw the beginning of the and the production of gases. One of the main ones is carbon dioxide created by the chopping down and of trees. The fuel used in cars and machinery also creates this gas. Scientists say it is already too late to prevent global warming but we should still try to limit the impact. A change in temperature of under degree Centigrade is enough to make the sea level rise. The BBC's climate change experiment predicts a degree rise in temperature by 2080 with less and more droughts.