Deforestation causing global warming when trees are cut down and burned, carbon is released into the air is carbon dioxide.the reasons people cut down trees are the following :to get the wood to build a houses for living , build material and equipment. For example, creating furniture a comfortable for people. Air pollution includes greenhouse gases and carbon dioxide cause global warming. carbon dioxide is produced from burning a gallon of gasoline that does not contain ethanol. For example, Carbon dioxide is produced by the vehicle. Every time people drive a car, carbon-rich auto exhaust enters the atmosphere. pollutants released from smokestacks at factories and power plants. The increase in greenhouses gases is the cause of most of the global warming. humans cause global warming because use of technology in daily life. For example, electric appliances in home use electricity that cause greenhouse gases emission. Some appliances like refrigerator and freezers also use refrigerants.