"We don't want to continue so we would love some action from the people in power because people are suffering and dying from the climate and ecological emergency today and we can not wait any longer".
The 16-year-old Swede, who has become famous for galvanising a generation of youngsters to fight for the environment, was surrounded by supporters and the press, prompting her to leave the march shortly after it began.
"We can't afford any more days without real action being taken". "We want you to act".
The participants demanded governments take concrete and immediate measures against global warming.
Holding hands, the teens sang a version of John Lennon's "Power To the People" and displayed banners with the logo of Fridays for Future, the global climate movement inspired by Thunberg.
The furious protests gripping Chile over social and economic inequality were "directly related to the environmental crisis", she said of the most severe wave of unrest since Augusto Pinochet's dictatorship ended almost 30 years ago.
The Lusitania, which runs daily, is the only direct train link between Lisbon and Madrid and takes nine hours to travel overnight between the capitals.
Naomi's outspoken position on such issues as Angela Merkel's disastrous immigration policy and climate change mark her as the kind of courageous, independent-minded, intelligent teenager of whom any parent could be proud.
"We don't want to continue", Thunberg said.
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At the last United Nations climate event in September, she harangued delegates, demanding: "How dare you?" and declaring, "You have stolen my dreams". "I do not understand why it has become like this", she was quoted as saying by Swedish newspaper Aftonbladet, whose reporter rode with them in an electric auto in Madrid.
Thunberg did not appear unsettled by the commotion surrounding her presence.
"I don't like being at the center of the focus all the time, but this is a good thing", she told Aftonbladet.
"The same programs I'm getting funded for now, are the same ideas I had when I was a high school student - only no one wanted to talk to me back then and trust a young person could have effective ideas", he said.
Elan Strait, who manages the "We Are Still In" initiative for the environmental conservationist World Wildlife Fund, said the movement is "a short-term band-aid not only to get those carbon dioxide emissions down but also to encourage policymakers to lay the ground for further achievements".
"Today, climate action means social equality, it's not possible to have social equality without environmental equality".
Thunberg paid a surprise visit to the venue of the talks and joined a group of some 40 teens staging a sit-in there to demand real action against climate change.
The venue is funded by Bloomberg Philanthropies, a charitable organization founded by billionaire businessman and former New York City mayor Michael Bloomberg, who is now seeking the Democratic nomination to run in the 2020 USA presidential election.