MPs were still considering a variety of evidence from experts and confidential sources and it seemed "premature to jump to a conclusion", he told BBC Radio 4's Today programme.

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Some critics, such as columnist Robert Novak, jump to the conclusion that a tax increase is the only way to make up that revenue difference.

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The AMS has been a bit slower to jump to the conclusion that human-caused climate change is happening than their colleagues in climatology.

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