The causes

There are many causes of global warming. The major cause is hydrocarbons pollution. This is caused by smoke, which comes out of car exhausts and factories. That smoke has many harmful gases like CO2, CO1 and methane. Another cause is reduction of rainforest. This forest has many trees, which have a vital role in our life because it releases CO2 and Oxygen. That helps in reducing the harmful gases in the air. Beside these, the hole in the Ozone layer is also a cause of global warming. This hole allows the sun’s rays to come in to the earth with all harmful radiation such as X-borne infrared and Ultra-violet. These radiations stay in the earth and cause what is called the greenhouse effect. They contribute to the heating surface of Earth's atmosphere.