Due to the depletion of the ozone layer, global warming is one of the most threatening issue., Another important environmental problem is the large number of species endangered by extinction., Air pollution is the contamination of the atmosphere by gaseous, liquid or solid wastes or by-products., Most of the oxides present in the air are produced by fossil-fuel-fired electric power plants, industrial boilers and residential furnaces., Car exhaust pollutants can be controlled by burning the fuel as completely as possible., Water pollution is the contamination of water by foreign matter., These can be micro-organisms, chemicals, industrial or other wastes or sewage., The most frequent causes of soil pollutions are farmyard waste and sewage sludge., They both may contain high levels of heavy metals., Light pollution means a great problem mainly in big metropolitan areas., In big cities there are so many sources of light that damages nocturnal species in their navigation., Selective waste collection is when there are different bins to store the different types of rubbish., Recycling means the conversion of waste to reusable material., As human beings cut down forests, the capacity of trees to remove carbon dioxide from the air has diminished., We can help protect the ozone layer by avoiding the use of CFC-based propellants., Non-renewable energy resources can be fossil fuels, crop wastes, animal dung., They are non-renewable because their use is limited., Renewable energy sources include hydro-power, modern biomass, solar, wind, ocean and geothermal power., The most efficient way to create energy is with the help of nuclear power plants., There are thousands of endangered species all around the world which means they are on the verge of extinction.

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