Causes of Global Warming

Everybody knows that global warming is an important issue that we should study and understand clearly. To understand this serious problem we should know the things that cause global warming. First cause is the heat that comes from the sun and the green house gasses. Also air pollution which can be caused by many things like the factories smoke because factories are one of the main sources of CO2 in the air. Another thing is cars smoke. There are millions of cars in the world and they sprit CO2 which will increase the heat of the air. Yet another cause which is burning trees because it increase the CO2 in the air. Cigarettes that people smokes can increase the CO2. People should care more about these causes so we can find the solutions.