However, he has said the government is committed to reaching net zero by 2050 - which means no longer adding to the total amount of greenhouse gases in the atmosphere, which are increasing global temperatures.
Earlier this week he defended flying to Scotland, to announce support for a carbon capture project, as "an efficient use of time for the person running the country". The decision was criticised by environmental campaigners, who said it would "send a wrecking ball through the UK's climate commitments".
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