Eleven climate change protesters stripped off in Britain's House of Commons on Monday during another lengthy debate about Brexit, chastising MPs for ignoring the urgent environmental needs of the planet.

"I'm tired of the time and resources our government wastes rearranging the deckchairs on the Brexitanic," Iggy Fox, a 24-year-old wildlife biologist and one of the protesters, said in a statement.

Mark Ovland, 35, said: "We are impelled to act in this way because the most important and pressing issue of our time is being flagrantly and recklessly ignored."

The protesters carried out their protest in the chamber's public gallery, stripping down to their underwear as MPs debated the merits of different Brexit strategies below.

Some of them wore thongs and pressed their naked buttocks against a glass partition as MPs stared but House of Commons Speaker John Bercow did not interrupt proceedings.

They had slogans like "SOS" and "Stop Wasting Time!" painted on their bodies. Some also glued their hands to a glass partition, making it harder for security guards to remove them.

Two of the group wore full grey body paint and elephant masks to make the point that the climate crisis had become an "elephant in the room" for British politicians.

The political crisis over Brexit has gripped Britain, allowing little government time for other issues.

The protest was organised by Extinction Rebellion, a British group which has staged a number of high-profile demonstrations in recent weeks.

British lawmakers will try once again Monday to agree a new approach to Brexit after rejecting Prime Minister Theresa May's divorce deal for a third time.

Brussels has set an April 12 deadline to agree the divorce terms May has struck with the bloc, find an alternative or crash out of the European Union.

The House of Commons held a first round of votes last week on various Brexit options but failed to agree, and is now hoping to produce a clearer result on Monday.

The main opposition Labour Party is backing two proposals which would keep Britain close to the EU after Brexit, but both would face strong resistance from May and most of her Brexit-backing ministers.

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