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Tidal energy is renewable plentiful and clean -Wind will be used as an environmental friendly sources of energy . -There are many ways will be used to solve the problem of pollution
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-Tidal energy is renewable ...plentiful......... and clean (plenty)
-Wind will be used as an ......enviromentally......... friendly sources of energy . (environment)
-There are many ways will be used to solve the problem of ....pollution...... (pollute)
-.......unfortunately....... , fossil fuels are harmful to the environment (fortunate)
-We should use them ....economic.......... and try to find out alternative sources of power . (economy)
-I think that solar energy can be an ...alternative.......... source of energy in the near future (alter)
-It's a clean source of energy . Sailboats couldn't move without this ......power....... (powerful)
-Limit car trips by relying on biking , walking public ..transportation........... (transport)
-Energy is used to ....produce........ a lot electrical thing (product )
-I don't think so . The solar penels are becoming .....uncheap....... and easy to install (cheap)
The search (26) for alternative sources of energy has led in various directions. Many communi- ties are burning garbage (27) and other biological waste products to produce electricity. Converting waste products to gases or oil (28) is also an efficient way to dispose of waste.
Experimental work is being done to derive synthetic fuels (29) from coal, oil, shale and coal tars. However that process (30) has proved to be expensive. Other experiments that are underway to harness power with giant windmills are also (31) being tested.
Some experts expect utility companies to receive hydroelectric power (32) derived from streams and rivers. Fifty years (33) ago hydroelectric power provided one third of the electricity used in the United States, but today it supplies only four percent. The oceans are another potential sources of energy. Scientists are studying ways to convert the energy of ocean currents, tides and waves (34) to electricity. Experiments are also underway to make use (35) of temperature differences in ocean water to produce energy.
In Britain, natural gas is the most popular fuel for heating homes, and for cooking. It is piped all over the country from the gas fields below the North sea. Natural gas is used chiefly as a direct source of energy, although it is also used in the chemical industry. At the moment, the supply is plentiful, but it will be running short by the end of the century, and it will run out during the 21stcentury unless new supplies are found. We could do without natural gas, as coal gas can be used as a substitute, and there should be enough coal to last for several centuries. However, it is a form of energy which is not only cheap, but also highly efficient.
1. What is natural gas used for?
à__________________________For heating homes, and for cooking. ________________________________________
2. Where does it come from?
à_______________________it comes from all over the country from the gas fields below the North sea.___________________________________________
3. What is gas used chiefly as? When will it run out?
à__________________Natural gas is used chiefly as a direct source of energy. It will run out during the 21stcentury________________________________________________
4. What can be used as a substitute for natural gas?
à____________________ coal gas can be used as a substitute for natural gas______________________________________________
5. Is natural gas expensive or cheap?
à________________It is cheap__________________________________________________
