A spokesman said: "This will be Michael Gove's opportunity to show he's ready to act on the climate and ecological emergency".
Environment Secretary Michael Gove is to meet climate change protesters tomorrow, the group has announced.
Climate protest group Extinction Rebellion has said it was left "frustrated" by talks with environment minister Michael Gove today, because he would not declare a climate emergency.
Extinction Rebellion is an worldwide protest group that uses non-violent civil disobedience to campaign on environmental issues.
Dr Rupert Read was one of five members of the group to meet Mr Gove and ministers from other departments, including the Treasury, in Westminster.
However, Extinction Rebellion's youth spokesperson Felix Ottaway O'Mahony, 14, said the government officials in the meeting "just spoke about what they're already doing".
He also said he was "open-minded" about the possibility of citizens' assemblies.
"We are with you in relation to lobbying the government government in relation to powers and resources, and we see you as allies in relation to lobbying the government".
Afterwards, Clare Farrell, co-founder of Extinction Rebellion, welcomed the "unexpected levels of interest" in the idea of citizens' assemblies, but said ultimately the meeting "resulted in no concrete outcome".
But Sam Knights, who works on Extinction Rebellion's strategy team, said the refusal to declare a climate emergency was "not only a political failure, but a moral failure".
Writing for Mirror Online ahead of Monday's meeting, the mayor said the protests had placed an "enormous burden" on police, but added: "I share the protesters' passion about tackling climate change and I absolutely agree that we need to do much more as a country, and fast". It is not something any of us have done lightly but feel is a political necessity.
They want greenhouse gas emissions to be reduced to net zero by 2025 and create a citizen's assembly of members of the public to lead on decisions to address climate change.