2.The first hydroelectric power plant was built in Niagara Falls in 1879.
3.Despite being the most polluting of fossil fuels,coal is still the largest sources of energy worldwide.
4.People will use biogas for fuels in home and for transport.
5.Veronica is a good friend of mine.
6. Are you interested in flying cars?
7.Although electric cars cause no air pollution,they still cause traffic jams.
