The UK strategy to reach net zero emissions by 2050 is “achievable and affordable”, according to the government’s official climate advisers. The Climate Change Committee said the plan is the most comprehensive in the G20 and strengthens the position of the UK as it prepares to preside over the Cop26 summit.

The CCC, which is independent, said the strategy was a big step forward from setting targets to planning their delivery, but said implementation would be a huge task.

The strategy is “very market-led” and focused on technology, the CCC said, from heat pumps to electric cars to low-carbon jet fuel. But it said much more action was needed to protect those on low incomes from the costs of going green.

The CCC also said the strategy had “nothing to say” on reducing the amount of meat and dairy people eat or on limiting growth in flying, which made hitting the climate targets more difficult and riskier. The government published a research paper on behaviour change but then swiftly withdrew it, saying it had been put out by mistake. Boris Johnson’s foreword to the strategy said there was not a “hairshirt in sight”.

There is no specific plan for farming and land, which produces 10% of UK emissions, the CCC said. Action is urgently needed, the CCC said, for example immediately ramping up woodland creation, which needs to triple to meet government targets.

“Overall, we see this as a big step forward,” said Chris Stark, CCC chief executive. “The strategy makes big decisions: fully decarbonised electricity by 2035, phaseout of sales of fossil fuel cars by 2030 and [gas] boilers by 2035, and rapid electrification of transport, industry and heating.”

“Clearly, it’s a very market-led strategy,” he said. “It’s noticeable how frequently the government puts the onus on business to invest and bring down the cost to the consumer. Many have criticised low public spending in some areas, but the government seems to be taking a different route. We shall see how that market-led approach fares.”

The net zero strategy had been repeatedly delayed and was seen as an important test of the UK’s credibility as host of Cop26. The CCC’s report on the strategy concludes: “It puts forward an achievable and affordable vision that will bring net benefits to the UK. This strengthens the position of the UK Presidency ahead of Cop26.”

The government’s ambition for emissions cuts in each sector are broadly similar to those recommended by the CCC, it said. However, the strategy to cut emissions from the production of oil and gas in the North Sea is less ambitious.

Ministers are more ambitious than CCC recommendations on energy efficiency in homes, but the CCC said their policies were underdeveloped. The government was heavily criticised over its botched Green Homes Grant scheme and for subsidising only 90,000 heat pump installations over three years – the target is 600,000 every year.

A Treasury review published alongside the net zero strategy said the costs of inaction on the climate crisis would be greater than the cost of action. But ensuring poorer people are helped with the upfront costs of low-carbon measures is very important, said Stark: “The Treasury review spelled out some principles, but it didn’t really conclude how the tax system will be used to support a fair transition.” The Treasury also failed to address how fuel duty, which brought in GBP37bn in 2020, will be replaced, he said.

The government decided not to support less meat eating and flying, Stark said: “We would say it makes the task bigger and makes it higher risk if tech doesn’t deliver.” Such behaviour change can also unlock wider benefits such as improved health and wellbeing, the report said.

The government rejected the CCC’s advice to implement a test to ensure that all policy and planning decisions are consistent with the path to net zero. Ministers are under pressure over a new coal mine in Cumbria and the new Cambo oil field off Shetland. “It’s not clear, therefore, how we can avoid locking-in new high-carbon developments,” Stark said.