The 17-year-old environmentalist has lashed out at politicians claiming they are happy to set targets for the decades in the future but quiver at calls for immediate action to stop climate change.She said: “We can treat a crisis like a crisis, as we have seen because of the coronavirus.“Treating the climate crisis like a crisis – that could change everything overnight.“So the first thing we need to do is understand we are in an emergency [and] admit the fact that we have failed – humanity collectively has failed – because you can’t solve a crisis that you don’t understand.”The UN climate summit was expected to begin in Glasgow this week but due to the coronavirus pandemic it has been postponed for a year.But Greta said she is not disappointed with the delay but said negotiations will just be “empty words, loopholes and greenwash”.The young environmentalist hit out at the EU MEPs who approved a staggering €400bn (£360bn) in subsidises for farmers last month.Greta said it is a disaster for the climate and biodiversity as agriculture is responsible for around a quarter of all greenhouse gas emissions.She said: “When it’s about something that is in 10 years’ time, they [the EU] are more than happy to vote for it because that doesn’t really impact them.READ MORE: Greta Thunberg brutally mocks Trump with near word-for-word parodySpeaking to the Guardian, she added: “The climate crisis is just one symptom of much larger crisis, [including] the loss of biodiversity, the loss of fertile soil but also including inequality and threats to democracy.“These are symptoms that we are not living sustainably; we have reached the end of the road.”Greta’s comments come just days after the US withdrew from the Paris climate agreement under the Trump administration.Back in 2017, Donald Trump announced Washington would be the first nation to leave the agreement.The Paris deal was drafted in 2015 to strengthen the global response to the threat of climate change.Andrew Light, a former senior climate change official in the Obama administration, said: “Being out formally obviously hurts the US reputation.“This will be the second time that the United States has been the primary force behind negotiating a new climate deal – with the Kyoto Protocol we never ratified it, in the case of the Paris Agreement, we left it.“So, I think it’s obviously a problem.”However, after millions of Americans flocked to the polls last week, Democrat Joe Biden was announced the new President of the United States.Mr Biden has promised to rejoin the Paris Agreement and to invest in low-carbon technology which would put the US on a path to drastically lower emissions within the next decade.