Kwasi Kwarteng risked stoking tensions with Rishi Sunak today as he insisted tax rises are not 'inevitable' to hit Net Zero targets.
The Business Secretary struck a different tone after a Treasury assessment warned that new levies will be needed to cover the costs of the transition.
He also said he did not 'accept' that subsidies for electric cars were bungs for the wealthy, as the analysis from Mr Sunak's department suggested.
And Mr Kwarteng dismissed 'unhelpful' recent Treasury briefings against him over bailouts for energy-intensive firms.
Alongside the PM's strategy for decarbonising Britain by 2050 yesterday, the Treasury released a stark assessment warning that the government cannot borrow to fund the costs of the transition.
It cautioned that tax rises would be needed to underwrite state investment - and that a way will have to be found to fill the black hole left as £37billion of revenue from fuel duty disappears.
Business Secretary Kwasi Kwarteng (left) struck a different tone after an assessment from Rishi Sunak's (right) Treasury warned that new levies will be needed to cover the costs of the transition
The Treasury cautioned that Net Zero will add to the fiscal pressures the country is already facing
The Net Zero plan sets out a pathway for how various elements need to reduce their carbon emissions over the coming years
Fossil fuel production plans 'well above levels needed to restrict climate change'
Countries are planning production of oil, coal and gas over the next decade at levels that is 'dangerously' out of sync with targets to curb climate change, the UN has warned.
A report by the UN Environment Programme (Unep) and research institutions found that planned production by fossil fuel-producing countries, including the UK, is 110 per cent above – more than double – the levels that will allow the world to curb temperature rises to 1.5C.
Despite increased climate action and pledges, the fossil fuel production 'gap' between countries' plans and what scientists say is needed to curb dangerous warming has hardly changed since a first report on the issue by the UN in 2019.
The warning comes days before world leaders meet for crucial UN climate talks in Glasgow, where pressure will be on countries to take more ambitious action to keep the 1.5C limit within reach.
Scientists warn that the world is already experiencing worse extremes at 1.2C of warming, and if temperatures go above 1.5C we face significantly more heatwaves, rainstorms, water shortages and drought, greater economic losses and lower crop yields, higher sea levels and greater destruction of coral reefs.
But there are reports it the Treasury assessment was originally even tougher and had been 'scrubbed' to remove the most alarming sections.
Although the government insists that there is no way of predicting the bill for getting to Net Zero, experts have suggested it will be at least a trillion pounds.
That would be far less than the costs of dealing with unmitigated climate change.
However, with the public sector considered likely to foot half that investment it implies an average annual cost of around £15billion - with the rest being picked up by consumers and business.
In a round of interviews today, Mr Kwarteng admitted making the transition to net-zero can be 'very costly' for consumers.
He told Sky News: 'It's a fine line you have to tread between making the transition and essentially forcing people and imposing costs on people to make the transition, and what we want to do is to keep people with us on the transition, on the journey.'
But Mr Kwarteng denied that tax rises were 'inevitable' due to the Net Zero efforts.
'I don't think that tax rises are inevitable because if we look at how we've moved, just in the last ten years, in this green transition 10 years ago 40 per cent of our electricity came from coal, basically burning coal. Today that figure's 1-2 per cent and renewables have taken up most of that difference, and costs haven't gone up in that time actually,' he said.
The Cabinet minister also rejected the idea that electric vehicle subsidies only benefited the rich.
'I don't accept that,' he said, before adding of the Treasury view: 'I accept lots of what they say.'
Mr Kwarteng said the UK had a choice to be 'world leaders in this or we can be laggards' in respect of a transition to net zero.
There was an extraordinary public row earlier this month when Treasury sources accused Mr Kwarteng of 'making things up' by saying he was in talks with Mr Sunak about helping struggling steel companies with soaring energy costs.
Mr Johnson seemingly sided with Mr Kwarteng and a package of loans was later unveiled.
Asked about the fallout on Sky News this morning, Mr Kwarteng insisted he spoke to Mr Sunak regularly and the Chancellor had congratulated him on the birth of his daughter.
But he admitted that the public sniping was 'unhelpful'.
Key elements in the Net Zero package yesterday included:
Paul Johnson, director of the Institute for Fiscal Studies, said the final bill for Net Zero would be 'well over £1trillion', spread over the next 30 years.
'What is interesting is that the Treasury's view is that most of that won't come from us the taxpayer, it will come via us as consumers or from industry though private investment,' he told BBC Radio 4's PM programme.
'This is a manageable cost because £1trillion is a lot, but over 30 years, and given the amount we invest in all sorts of things in any case, it is manageable. But it is a pretty substantial sum.'
Mr Johnson yesterday insisted the plan would benefit both the UK and the planet in the long run.
He said that no one would be forced to rip out their old boiler or sell their petrol car.
Defending the decision to go faster than bigger polluters like China, he said: 'History has never been made by those who sit at the back of the class.'
He added: 'The UK's path to ending our contribution to climate change will be paved with well-paid jobs, billions in investment and thriving green industries, powering our green industrial revolution across the country.
'By moving first and taking bold action, we will build a defining competitive edge in electric vehicles, offshore wind, carbon capture technology and more, whilst supporting people and businesses along the way.'
In a 135-page Net Zero Review, the Treasury acknowledged the need for the world to tackle climate change.
It said that left 'unmitigated', climate change would cause massive damage to the economy. The cost of 'global inaction' would 'significantly outweigh the costs of action,' the document said.
But it warned net zero would place 'upwards pressure on consumer prices of goods and services that are more carbon intensive and weaken the profitability of the companies that produce them'.
And it said that jobs in some industries could be lost abroad if the rest of the world did not move at the same pace.
The Treasury said a way will have to be found to fill the black hole left as £37billion of revenue from fuel duty disappears
Boris Johnson wants to push Britain towards new sources of energy for homes, including hydrogen, left, and ground source heat pumps, right