This file photo dated May 22, 2019 shows  British Steel's Scunthorpe plant at dawn in north Lincolnshire, north east England. (PHOTO / AFP)

LONDON - Britain's new climate action plan is unlawful because ministers were given misleading information about the prospects of meeting legally-binding emissions targets, three environmental campaign groups told London's High Court on Tuesday.

Friends of the Earth, ClientEarth and the Good Law Project are taking legal action over carbon budgets set by the government to meet Britain's target of net zero by 2050.

The case comes amid concerns Britain has lost its position as a global leader on climate action and as environmental groups around the world step up legal challenges to press governments and corporations to do more to tackle climate change.

The British government had to revise its plans, which were signed off last year. But the groups say the new plan is also unlawful because then energy minister Grant Shapps was not told of the risk that policies to reduce emissions could not be delivered

A similar case brought by the three groups in 2022, after which the High Court ruled Britain had breached legislation designed to help reach the 2015 Paris Agreement goal of containing temperatures within 1.5 degrees Celsius of pre-industrial levels.

The British government had to revise its plans, which were signed off last year. But the groups say the new plan is also unlawful because then energy minister Grant Shapps was not told of the risk that policies to reduce emissions could not be delivered.

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Friends of the Earth's lawyer David Wolfe said Britain's Climate Change Committee warned last year there were credible policies in place for less than 20 percent of the reductions required to meet the carbon budget for the period 2033-2037.

He added in court filings that Shapps "proceeded on the assumption that the reductions in emissions of greenhouse gases from all of the proposals and policies ... would all be delivered in full when there was no evidential basis".

Lawyers representing the Department for Energy Security and Net Zero, however, said Shapps did not assume emission reductions would be delivered in full.

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Jonathan Moffett also said in court filings that Shapps' decision required "an evaluative, predictive judgement as to what may transpire up to 14 years into the future", which was a matter for elected politicians rather the courts.