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The number of EU countries on board with a pledge to go carbon neutral by 2050 has grown rapidly in recent months – with 18 out of 28 now supporting the policy.
Germany, Greece, Italy and Slovenia have added their names to the list of member states, according to internal EU documents – paving the way for an EU-wide policy to be adopted at a summit next week.
Momentum has built for the plan since the last European Council summit in March when just eight countries supported the move.
The commitment by Germany, Europe's biggest economy and a major polluter, is significant – given Angela Merkel's government's previous reticence.
Opinion polls suggest Ms Merkel's party faces being eclipsed by the country's Green party, with environment up the agenda. Greens also did well across the continent in European elections.
Surveys across the continent, including in the UK, also suggest climate change is rocketing up the political agenda – notably in the wake of school strikes and protests by Extinction Rebellion.
Theresa May committed the UK to the 2050 target last week, claiming Britain would become the first G7 country to legislate for the target. Labour has said it would bring the target forward to 2030 and achieve it with a Green New Deal by investing in new technology.
The support for the move might bring forward action on climate: as recently as last week, the policy was expected to be kicked into the long grass at June's meeting and further discussion was pencilled in for 2020.
The rotating EU presidency – which controls the agenda at summits – will from this summer be held by Finland, which is taking an even more ambitious approach of going carbon-neutral by 2035. Finland's new governing coalition includes the country's Green party, which notably controls its foreign ministry.
Extinction Rebellion: Climate change protests cause chaos in LondonShow all 46 1 /46Extinction Rebellion: Climate change protests cause chaos in London Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf A protester gives a thumbs up as he stalls a DLR train at Canary Wharf station in London
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Extinction Rebellion: Climate change protests cause chaos in London City of London Protesters hold up traffic on Upper Thames Street in the City of London
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Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf Protesters hold a banner as they hold up a DLR train at Canary Wharf station in London
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers remove plants that were placed in the occupation of Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Police officers arrive at Oxford Circus as they prepare to remove protesters during the fifth day of a coordinated protest by the Extinction Rebellion group, April 19
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge An activist waters the plants at the occupation on Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Undeterred by over 400 arrests, climate change activists continued their demonstration into a fifth day in London with a small protest at the country's main Heathrow Airport, along with the ongoing protest camps at other iconic locations around the British capital
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Protesters with the words 'glued on' written on their hands hold hands as police officers arrive at Oxford Circus
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers circle the lorry that serves as the central stage to the Waterloo Bridge occupation, repeating their tactic from a earlier at the Oxford Circus occupation
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Oxford Circus reopens after being closed for days due to occupation
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Officers prepare to move in on the occupation of Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Activists relax on a sofa at the occupation on Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus British actress Emma Thompson talks to members of the media from atop the pink boat after police officers surrounded the boat being used as a stage as climate change activists occupy the road junction at Oxford Circus in central London during the fifth day of environmental protesst by the Extinction Rebellion group
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge An Extinction Rebellion demonstrator is carried away by police on Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Activists on Waterloo Bridge have made a garden for their occupation site, April 20
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Demonstrators began blocking off a bridge and major central road junctions on April 15 at the start of a civil disobedience campaign calling for governments to declare an ecological emergency over climate change, to reduce greenhouse gas emissions to zero by 2025, halt biodiversity loss and be led by new "citizens' assemblies on climate and ecological justice"
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Emma Thompson joins the Extinction Rebellion protest at Oxford Circus. Thompson spoke from the pink boat at the centre of the occupation
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Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Extinction Rebellion protesters sit outside Heathrow Airport on April 19
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Extinction Rebellion: Climate change protests cause chaos in London Heathrow airport Climate protestors hold a demo outside Heathrow Airport
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Police officers detain a climate change activist at Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Marble Arch Protesters prepare for another day at Marble Arch as the Extinction Rebellion protests enter their fifth day
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus British actress Emma Thompson gives an address from the stage atop the pink boat
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Actress Emma Thompson takes a photo with a Extinction Rebellion demonstrator
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Climate change activists blockade Oxford Circus on the third day of an environmental protest by the Extinction Rebellion group
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change activists stand atop a bus shelter as they take part in a blockade of Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf Police is seen as climate change activists demonstrate during the Extinction Rebellion protest, at Canary Wharf DLR station in London
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Police speak to climate change activists blockading Waterloo bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change activists, one (right) with her hand glued to the underside of a truck parked across Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Environmental campaigners protest in the centre of Oxford Circus
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Extinction Rebellion: Climate change protests cause chaos in London Jeremy Corbyn's Home Climate change activists from Extinction Rebellion protest sit after glueing themselves to the front fence of Britain's opposition Labour Party leader Jeremy Corbyn's house
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Extinction Rebellion: Climate change protests cause chaos in London Marble Arch Dozens of tents have been pitched at Marble Arch in a large scale occupation
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Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf station Police remove climate activists who glued themselves on top of a train at Canary Wharf station
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus Police forces carry a protester
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Extinction Rebellion: Climate change protests cause chaos in London Canary Wharf station A climate change protestor who glued his hand to a window halts a DLR train
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Pedestrians and a cyclist pass graffiti drawn by protestors who blocked Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Climate change protestors practice yoga on Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge A climate change activist gestures while being detained by police officers
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge Protestors sit on the road
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Extinction Rebellion: Climate change protests cause chaos in London Waterloo Bridge
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Extinction Rebellion: Climate change protests cause chaos in London Oxford Circus
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Countries in central and eastern Europe are most opposed to the plan, with Poland's hard-right government the largest opposed. The European parliament has proposed a 25bn euro "Just Transition Fund" to help member states with less developed economies keep up. The details of any EU-wide policy would have to be hashed out at the summit.
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