The use of "the" itself is correct. But I think you had better capitalize E in the "earth" if you use it to mean our planet. 1 - The most serious problem for the Earth is (the) contamination of water.
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X11It sounds more correct, and ALD (Advanced Learner's Dictionary) has a sentence that says the same.Could you explain why your version sounds more correct and in what points my version is less correct?