in Kent, joined the strike in March - including one boy in school uniform who appears to have walked straight out of school

Strikes took place in over 120 countries around the world. A massive demonstration was held in Milan outside the iconic Duomo

Thousands of students thronged the streets of Lisbon on the international day of climate protest inspired by Miss Thunberg

'Given the urgency the world faces, it's vital nations come up with more ambitious plans both this year and in 2020 as stated in the Paris Agreement.

'This is how we will not only reach our collective climate goals, but how we will build a cleaner, greener and more prosperous future for all people.'

While recognising the importance of climate change in response to the first UK strike, Downing Streetsaid the disruption increased teachers’ workloads and wasted lesson time, and Education Secretary Damian Hinds said missing class was not the answer.

The children's demands for urgent action to treat climate change as a global emergency come in the wake of a UN report last year which warned that limiting global temperature rises to 1.5C above pre-industrial levels, beyond which climate impacts become increasingly severe, requires unprecedented action.

That includes cutting global carbon dioxide emissions by almost half within 12 years, and to zero by mid-century.

Miss Thunberg's arrival in London today comes on the ninth day of the the Extinction Rebellion protests, after the activists kept up their demonstrations and sit-ins over the long Bank holiday weekend.

a half-naked protestor covered in body paint joined comrades in Parliament Square on the