Think of the process of burning it completely.
See the options
Think about side effects of depletion of ozone layer.
Lichens are sensitive to sulphur dioxide.
Think about the green house effect.
It is done by measuring an amount of oxygen that is required in the process.
Think of all green house gases.
For example the numbers of earthworms in the soil can be used to indicate the health of the soil.
Think about the causes of each global warming, greenhouse, Eutrophication, and Ozone.
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