From July 2021 to July 2022, there were 336,805 adverts relating to environmentally-friendly products, services or processes, up from 124,600 the previous year.
The largest number of green jobs came from the professional, scientific and technical services sectors, which accounted for 110,000.
The construction industry was second with 38,000.
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In Scotland, 3.34% of all job adverts were for green jobs - the highest proportion for any region. For Wales the figure was 2.24% (equivalent to 8,100 jobs), with Northern Ireland reaching 1.95%.
There was a large regional disparity in green job adverts as 7,594 were advertised in the North East, compared to 110,067 for London and the South East.
Carl Sizer, PwC UK’s head of regions, emphasised the need for upskilling workers to help the country meet its green ambitions.
He said: "It's striking that one in five new green roles are based in the capital. If growth continues on this trajectory, the compounding effect means the green economy will increase London’s dominance over other cities and regions. If we want to meet our net zero ambitions while driving growth, then the green economy needs to be nationwide.
“This year’s Barometer shows that many green jobs are in professional and scientific roles, while there is an ever-growing gap in new green trades jobs which are equally vital to net zero plans.
"We must therefore be conscious that this is not just a story of job creation, but also one that highlights the critical requirement for upskilling and training to prepare the UK workforce for the jobs that will realise the country’s ambitions."
Small and medium sized enterprises (SMEs) have a key role play in a green workforce as they account for 16 million jobs across the UK.
The report said: "One of the barriers identified as holding back SMEs’ transition to net zero is limited availability of the
knowledge and skills to do so. Participants felt that the public sector could assist in this endeavour by supplying organisations with the necessary resources."
Research from Kite Insights in June 2022 found 77% of employees in SMEs are ready and willing to act on climate change, while 63% were calling for climate training at work.
Sophie Lambin, founder and CEO of Kite Insights and The Climate School, called for more help for SMEs to help transition to a greener workforce.
Speaking to HR magazine, she said: "It's difficult for SMEs to relate their business to national or global climate commitments. Governments can help close the gap by translating climate goals for SMEs in line with their scale and contribution to carbon emissions.
"Most importantly, SME employees are on the frontlines of the green economy. If governments can provide the right incentives for companies to upskill workers and create new green jobs, they can help ensure more people are ready for the transition."
