Carbon dioxide, the most important greenhouse gas, is a mild acid.

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Mr Swinney noted, with only a mild degree of festive acid, that the extra money reduced the overall real-terms cut in Scotland's capital allocation from 33% to 26%.

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The result, though more mild than the original preparation, has enough acid to cut through the fatty butter.

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Mild acne can be treated with over-the-counter remedies such as salicylic acid or benzoyl peroxide.

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