A claim that using recycled cooking oil to fuel aeroplanes can help solve the climate emergency has landed Andrea Leadsom in hot water.

Friends of the Earth has sharply criticised the business secretary after she hailed the move as a step towards the UK achieving its target of ‘net zero’ carbon emissions by 2050.

The green group pointed out that the government’s own climate advisers had warned the aviation industry must not rely on biofuels to offset an increase in emissions in the years to come.

“Biofuels are not the magic solution to the climate emergency,” said Mike Childs, Friends of the Earth’s head of policy.

“The international dash to expand the use of bioenergy and biofuels has had significant impacts: displacing food production, harming biodiversity and seizing indigenous peoples’ land.

“If ministers really want to address aviation’s contribution to the climate crisis they must take steps to cut flights – particularly for frequent flyers – and abandon plans to expand Heathrow and other airports.”

The row blew up after Ms Leadsom hailed a “head-start” by Airbus in what she dubbed “a new decade of decarbonisation”.

“Last month, they celebrated the first flight of one of their ‘Beluga’ Super Transporters with sustainable aviation fuel,” she told an event in London.

“An aircraft over 50-feet high and nearly 200-feet long being powered – in part – by recycled cooking oil!

Climate change: Decade's defining issue in pictures Show all 20 1 /20 Climate change: Decade's defining issue in pictures Climate change: Decade's defining issue in pictures California In this decade, humans have become ever more aware of climate change. Calls for leaders to act echo around the globe as the signs of a changing climate become ever more difficult to ignore Getty Climate change: Decade's defining issue in pictures Athens, Greece Fierce wildfires have flared up in numerous countries. The damage being caused is unprecedented: 103 people were killed in wildfires last year in California, one of the places best prepared, best equipped to fight such blazes in the world AFP/Getty Climate change: Decade's defining issue in pictures Redding, California Entire towns have been razed. 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There have been numerous major oil spills this decade, the most notable being the BP oil spill in the Gulf of Mexico in 2010 AFP/Getty Climate change: Decade's defining issue in pictures Amazon rainforest, Brazil More recently, large swathes of the Amazon rainforest were set alight by people to clear land for agriculture AFP/Getty Climate change: Decade's defining issue in pictures California This decade may have seen horrors but it has led to an understanding that the next decade must see change if human life is to continue Getty

“In 2018, sustainable fuels covered just 0.1 per cent of the industry’s needs. So there’s a massive opportunity to grow this – greening existing power sources as we develop new ones.”

In a tweet on the Airbus move, Ms Leadsom added: “UK will do everything possible to tackle global climate change.”

The controversy comes after ministers admitted they would not decide how to fund a strategy to end the UK’s contribution to climate change until the end of the year.

It means the plans – which will require huge and potentially unpopular changes to transport, energy and agriculture – will only emerge more than a year after the legal commitment was made.

The government had already been fiercely criticised for lacking urgency and practical solutions for tackling the climate emergency in announcements so far.

The climate crisis was barely mentioned by Boris Johnson during the election campaign and he boycotted the Channel 4 debate on the issue – when he was replaced by a melting ice sculpture.

A spokesperson for the department for business, energy and industrial strategy (BEIS) said: “The secretary of state has always been clear that a range of solutions will be required to eliminate our contribution to climate change by 2050.

“Biofuels, when sourced correctly and sustainably, are an important part of this mix - but cannot be a replacement for renewables, carbon capture, and energy efficiency.”

The prime minister is under pressure to step up action after a poll for The Independent found overwhelming support for ending net carbon emissions by the end of this decade.

The 2050 commitment is described as “net zero” because air travel and farming are viewed as unavoidable, but carbon from those activities would be taken out of the air by growing trees or burying carbon dioxide.