One of the most controversial issues which threats our environment is global warming. It means, increasing temperature due to air pollution causes climate changing that is became our planet warmer. Firstly, with growth of population in recent century, a large number of trees has been cut for building new towns and cities. In this case, governments should present agriculture plans to increase more planting and parliaments should support laws to prevent cutting trees. Secondly, fossil fuel is burning to operate factories, power stations and cars which should be less used by developing public transportation. Thirdly, electronic devices like computers, TV and lights are used too much electricity which rise temperature that should be replace with renewable energy resources.