Causes of Global Warming

Global Warming is caused by many things. The causes are split up into two groups, man-made causes and natural causes.
Natural Causes
Natural causes are causes created by nature. One natural cause is a release of methane gas from arctic tundra and wetlands. Methane is a greenhouse gas which traps heat in the earth's atmosphere. Another natural cause is that the earth goes through a cycle of climate change. This climate change usually lasts about 40,000 years.
Man-made Causes
Man-made causes probably do the most damage. There are many man-made causes. Pollution is one of the biggest man-made problems. Pollution comes in many shapes and sizes. Burning fossil fuels is one thing that causes pollution. Fossil fuels are fuels made of organic matter such as coal, or oil. When fossil fuels are burned they give off a greenhouse gas called CO2. Also mining coal and oil allows methane to escape. Methane is naturally in the ground. When coal or oil is mined you have to dig up the earth a little. When you dig up the fossil fuels you dig up the methane as well.
Another major man-made cause of global warming is population. More people mean more food, and more methods of transportation. That means more methane because there will be more burning of fossil fuels, and more agriculture. Agriculture is going to be damaged by global warming, but also agriculture is going to help reduce the causes of global warming by converting the CO2 to oxygen. Another source of methane is manure and animals like cows are a source of food which means more manure and methane. Another problem with the increasing population is transportation. More people mean more cars and more cars means more pollution. Also, many people have more than one car.
Carbon dioxide is the main cause of global warming. The increase in population makes the problem worse because we breathe out CO2. Also, the trees that convert our CO2 to oxygen are being demolished because we cut trees and build our homes and buildings but without replacing it with something that can preserve nature, I instead we ruin it more, so we are constantly taking advantage of our natural resources and giving nothing back in return.