In September, Thunberg addressed the U.N. General Assembly in NY to berate world leaders, accusing them of having "stolen my dreams and my childhood". We expect to arrive at Doca de Santo Amaro, Lisbon sometime between 8.00-10.00 tomorrow morning'. We are all looking forward to see you there!'
Despite the grim statistics, young delegates said they were inspired by Thunberg's determination to minimise her own carbon footprint by twice braving the Atlantic instead of flying: which they saw as a symbol of resourcefulness and defiance.
Thunberg's arrival in Lisbon coincides with the release of a bleak report by the Geneva-based World Meteorological Organization.
The UN Environment Programme has also warned emissions would have to fall by 7.6 per cent a year up to 2030 to limit temperature rises to no more than 1.5C above pre-industrial levels.
The conference kicked off on Monday with UN Secretary General Antonio Guterres warning that the planet had reached a "point of no return".
Thunberg doesn't travel by plane because the high emissions associated with air travel.
Swedish teen climate activist Greta Thunberg looks on during a march and rally at the Youth Climate Strike in Los Angeles, California, U.S., November 1, 2019.