Unless present policies are revised urgently the world may probably suffer irreversible damage ...........

English ( Master) Sentence Improvement

Unless present policies are revised urgently, the world may probably suffer irreversible damage from the unregulated use of fossil fuels leading ultimately, to the destruction of mankind itself.

Until present policies are revised for good

Unless present policies should be revised urgently

Unless they revised present policies urgently,

With present policies revised on an urgent basis

No improvement required

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Explanation:

Correct Answer is (e).Options A and B are incorrect due to the usage of for good and should be, which change the original meaning of the sentence.
Option C introduces an ambiguous word they and is incorrect.Option D is opposite to the sentence and wrong
Clearly, the sentence is absolutely correct and thus needs no improvement.Option E is hence the correct answer.