give one example to show that a change can be desirable and undesirable at the same time.
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A very good example is the burning of coal for a household fire.
In this process, coal i.e. carbon burns with oxygen to produce CO2 and heat energy.
It is a desirable process as it is required for the generation of heat for many purposes like cooking, etc.
On the other hand, it is also undesirable as CO2 is a greenhouse gas and results in global warming and climate change and also pollution to some extent.
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