Global warming
Manufacturing processes in factories or the use of day-to-day products like cars can cause harmful chemicals, such as carbon monoxide and nitrogen oxides, to be released. These chemicals pollute the air and natural land. Worldwide environmental awareness has led to limitations on the levels of pollution and emissions of greenhouse gases, as well as targets on renewable energy generation, to try to stop global warming. The development of more efficient electrical products, such as low-energy light bulbs, and better building insulation has cut down on energy costs. Some countries offer incentives to increase the use of emission controls, electric vehicles and energy-saving devices, such as better insulation and automatic shut-off devices.