Mr Clarke said good behaviour in prison would no longer be seen as an important factor in determining release dates.

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The NAC noted that the statements in the press release were accurate and concluded that, in any event, publication of the information in the press release was not a mitigating factor for purposes of sanctions.

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Weather also appears to have been a key factor, as a tough winter led to a strong release of pent-up demand at the start of spring.

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Heightened methane emission from wetlands and permafrost has regularly been touted as a potential amplifying factor in climate change, with warmer weather stimulating their release and so producing further warming.

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