Global WarmingGlobal warming is the increase in the average temperature of the Earth's surface air and oceans.Climate change is any major change in measures of climate,such as temperature, rainfall and wind.Scientists have debated about global warming for years.Many have different opinions about the extent to which greenhouse gases are responsible for it.Greenhouse gases, such as carbon dioxide,are produced by factories, power stations and vehicles.They trap heat in the Earth's atmosphere.Research shows the level of carbon dioxide gas in the Earth's atmosphere has increased by more than 30% in the last 250 years.Carbon dioxide is produced by burning oil and coal.An increase in global temperatures has led to other problems.Scientists have observed a rise in sea levels and a melting of ice in the Earth's Polar areas.Scientists also believe that global warming is affecting endangered plants and animals,sea life and the seasonal activities of organisms.
