Answers

2014-06-30T23:52:07+05:30
Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:
 
- the fuel used to heat the water for running a steam engine was usually coal
- burning the fuel emitted carbon-di-oxide into the atmosphere - thick, black smoke irritated the respiratory tract and caused itchiness in the eyes - there was significant air and noise polution caused by steam engine - furthermore, railroads supported many industries, thus indirectly causing more pollution - hybrid engines definitely helped to cut down pollution levels - since diesel-electric power is used in most hybrid engines, pollution has not been eliminated completely - burning diesel still emits pollutants, and the residue heat after charging the batteries is also emitted into the atmosphere

- pollution has led to ecological imbalance, global warming, health problems

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2014-07-01T11:58:50+05:30
- the fuel used to heat the water for running a steam engine was usually coal - burning the fuel emitted carbon-di-oxide into the atmosphere - thick, black smoke irritated the respiratory tract and caused itchiness in the eyes - there was significant air and noise polution caused by steam engine - furthermore, railroads supported many industries, thus indirectly causing more pollution - hybrid engines definitely helped to cut down pollution levels - since diesel-electric power is used in most hybrid engines, pollution has not been eliminated completely - burning diesel still emits pollutants, and the residue heat after charging the batteries is also emitted into the atmosphere
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