Scientists have written to Rishi Sunak asking him to stop “politicising” and attacking the Climate Change Committee (CCC), an independent body that exists to advise the government on five-year “carbon budgets” necessary to meet its 2050 target. This week Sunak spoke about his plans to weaken his government’s environmental policies. When asked about comments from Chris Stark, the chief executive of the CCC, saying that the government would not hit the carbon budget with its current plans, Sunak replied: “I am very happy to get opinions and advice from everybody, and everyone’s entitled to their view.” He added: “For those who disagree with me … the question’s for them – they should explain to the country why they think it’s right that ordinary families up and down the country should fork out five, 10, £15,000? … I don’t think they need to, and if someone disagrees then they should explain why.” Subsequently Conservative headquarters wrote to journalists outlining measures from the CCC and asking them to demand that the Labour party reveal whether it would adopt them in government. Bob Ward, the director of communications at the Grantham Institute for Climate at Imperial College, said in a letter to Sunak, seen by the Guardian: “My primary concern is a document that was circulated to journalists by Conservative campaign headquarters after your speech, which attempted to politicise the advice of the Climate Change Committee. “Although this document was described as ‘Questions to Labour on Net Zero’, it included a section on ‘New measures which the CCC has said would need to be introduced …’ It cited issues described as ‘road taxes’, ‘flight taxes’ and ‘diet change’.” Ward continued in his letter: “While your government is perfectly entitled not to accept advice from the committee, it is extremely unhelpful to politicise its role and its advice in this way. I hope that you will find an opportunity to acknowledge this mistake and to reaffirm the importance of the committee offering robust and rigorous independent advice on compliance with the Climate Change Act.” Prof Martin Siegert, a co-director of the Grantham Institute, said this was a “cynical move” to openly add criticism to the body that offered independent advice, adding: “I have listened with concern in recent days. The PM’s focus, and those of cabinet and other ministers and members of government, on claiming the CCC is recommending policies that are unaffordable to the general public. They are clearly not government policy, and can only become policy under this government. When asked where these ideas came from, the response has been that the CCC recommended them.” The government is in charge of appointing the new chair of the committee, and there are fears among the scientific community that Sunak will choose someone who allows him to weaken the next carbon budgets, or that the prime minister will stoke public distaste for the committee in order to change the carbon budgets in parliament. A spokesperson from No 10 responded by sending comments Sunak made to broadcasters earlier in the week in which he said: “Lots of people will have lots of different views on this. We’ve been through the numbers. we’re confident that we are on track to deliver all our targets. And I would point out people have predicted we would miss our carbon budgets in the past, but we’ve actually met every single one of them.”