Comparison of energy sources
Local pollution, like general pollution, depends on the type of engine involved, and on the
particular energy source that is being used. However, there has been no quantitative study of the comparative
social costs of different transport energy sources. A few emission rates can be given; otherwise, only
qualitative comments can be made.
To begin with, there is a difference between energy sources for rail transport. Pollution from
railways varies depending on whether the train is driven by electric or diesel power, the main difference
being in the location of the pollution and in the emission rate. The emission rate is a little lower in thermal
power stations than for on-board engines; it is appreciably lower -- virtually zero -- for nuclear power plants
and hydro stations. This phenomenon may explain the difference between estimates of rail pollution for a
country, and shows the care required when transposing results from one country to another.
Comparison of energy sourcesLocal pollution, like general pollution, depends on the type of engine involved, and on theparticular energy source that is being used. However, there has been no quantitative study of the comparativesocial costs of different transport energy sources. A few emission rates can be given; otherwise, onlyqualitative comments can be made.To begin with, there is a difference between energy sources for rail transport. Pollution fromrailways varies depending on whether the train is driven by electric or diesel power, the main differencebeing in the location of the pollution and in the emission rate. The emission rate is a little lower in thermalpower stations than for on-board engines; it is appreciably lower -- virtually zero -- for nuclear power plantsand hydro stations. This phenomenon may explain the difference between estimates of rail pollution for acountry, and shows the care required when transposing results from one country to another.
การแปล กรุณารอสักครู่..
