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Sample answer
The bar chart shows the amount of different elements required for making 1,000 polystyrene and paper cups.
The production of 1,000 polystyrene cups needs 8 kg of petroleum and 13 kg of other chemicals. These two kinds of elements are heated with great quantities of steam which is ten times as much as other chemicals. This process is rather energy-saving, only costing 0.6 m3 of water and 6 kilowatts of electricity.
However, in the process of making paper cups, the consumption of water and electricity is more than ten times that in polystyrene cups. It also requires more petroleum, with 18 kg being added. It is worth mentioning that the production of paper cups doesn’t need much other chemicals and steam. The amount of other chemicals is less than two thirds of that in polystyrene cups.
Overall, the production of polystyrene cups is environmentally friendly, because it costs...