Such a declaration was a demand of the Extinction Rebellion activists who paralyzed parts of London this month.
However, it said the shadow chancellor did not commit to changing the proposed date in Labour's climate change policy to reduce greenhouse gas emissions to net zero by 2050 - although he agreed to consider a new, more ambitious target of 2030.
John Sauven, the executive director of Greenpeace UK, said: "Climate activists, young and old, have put the UK government under enormous pressure to officially recognise the climate emergency we are facing". It is not something any of us have done lightly but feel is a political necessity. "That is why we need the creation of a national Citizens' Assembly on climate and ecological justice".
He made clear then that he was ready to meet the protesters, saying: "The point's been made, let's now have a serious conversation collectively about how we deal with this situation".
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Finally, Pratt floats the camera to Sean Gunn - the brother of Guardians director James Gunn , and who is the stand-in for Rocket Raccoon.
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Brent crude futures were down 14 cents at $72.01 a barrel around 8:35 a.m. Both benchmarks fell around 3 per cent in the previous session.
Although the Department for Environment, Food and Rural Affairs described the meeting as "private", the campaigners said they would film it and make the footage public.
Gove said climate change is a "grave" challenge, but stopped short of calling it a climate emergency.
Mr Khan suffered a backlash on social media after declaring that London should return to "business as usual" after the protests.
Farhana Yamin, 54, a prominent climate change lawyer who glued herself to Shell's London headquarters during a week of protests, said: "I definitely think he could have taken the initiative to say Defra will show leadership that was necessary for the nation to come together, I was expecting a little bit more".
Theresa May's official spokesman told a Westminster press briefing: "We are committed to tackling climate change and being the first generation to leave the environment in a better state than we found it".