Rebellion Extinction says that meeting with Environment Secretary Michael Gove was "very disappointing" because he refused to declare a climate emergency.
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But its youth representative, 14-year-old Felix Ottaway O'Mahony, said: "The rebellion has to continue because … our futures are not safe."
Mr Gove said he "shared their high ideals "to tackle climate change.
Earlier, the group also with shadow chancellor John McDonnell, who promised to engage with the group's demands, but activists said Labor needed to be" more ambitious "with its targets.
The Welsh and Scottish governments have both declared a climate emergency, along with dozens of towns and cities, including Manchester and London.
There is no single definition of what that means, but many local areas say they want to be carbon-neutral by 2030, and proponents say the situation amounts to an emergency because the United States has been the world's only 12 years left to limit a climate change catastrophe.
Extinction Rebellion has three main demands:
- For the government to "tell the truth" about the scale of the environmental crisis the world faces
- For the UK legally binding policies to reduce carbon emissions to zero by 2025
- For the government to form a Citizens' Assembly to oversee the changes needed to achieve this
Following its large scale protests, the number of the group's representatives went to the Department of Environment, Food and Rural Affairs to meet Mr Gove, Exchequer Sec retary to the Treasury Robert Jenrick and the prime minister's environmental advisor Lord Randall.
Mr. Gove said the group's first demand was "on the money" and agreed there was a need for a level of public understanding about climate change.
He also said he was "open-minded" about the possibility of citizens 'assemblies.
But the environment secretary said, while he believed the state of carbon emissions was a "dig" one, there were questions around the timescale to reduce them and whether declaring a climate emergency was necessary.
"There is an open question to what the date should be and I am open to a higher level of ambition for this government than we have seen in the past, "he said.
"We have got to take action and what would like this government to be at, not what it proclaims, but what it achieves, and there is much more that we need to do." is unsupported on your device
Afterwards, Clare Farrell, co-founder of Extinction Rebellion, welcomed the "unexpected levels of interest "in the idea of citizens' assemblies, but ultimately said the meeting" resulted in no concrete outcome ".
Climate change lawyer Farhana Yamin also praised a pledge by Mr. Gove to discuss citizens' assemblies with London Mayor Sadiq Khan, and a promise to raise the group's demands with other members of the cabinet.
But Sam Knights, who works on Extinction Rebellion's strategy team, said the refuse to declare a climate emergency was "not only a political failure, but a moral failure".
He added: "It is important to stress how out of the current political class is with ordinary people.
"We see this in the democratic deficit we have in this country and it is why we had to be out on the street in force. It is not something any of us have done lightly but feel is a political necessity. "
Following the meeting with Labor, Extinction Rebellion said Mr McDonnell" acknowledged the failure "of previous policies to tackle climate change.
The group also said it would request a meeting with the entire shadow cabinet for the demands to be presented.
However, it said the shadow chancellor did not commit to changing the proposed date in Labor's climate change policy to reduce greenhouse gas emissions to not zero by 2050 – although it is agreed to consider a new, more ambitious target of 2030.
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