There is an “acute risk” that Scotland will miss its targets to heavily cut carbon emissions because government policies are too vague and weak, an influential advisory body has warned.

The Climate Change Committee, which advises all the UK’s governments on climate policies, said the Scottish government was currently unable to prove how it would hit its ambitious promise to cut CO2 emissions by 75% by the end of the decade.

In an unusually critical statement, Lord Deben, the CCC’s chair, said “the credibility of the Scottish climate framework is in jeopardy.”

His challenge comes after Nicola Sturgeon, Scotland’s first minister, staked her government’s reputation on a partnership deal with the Scottish Green party in August which commits them to tougher policies on combating climate heating.

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