Greta Thunberg speech projected onto UK's Houses of Parliament

Climate activists are calling on the government to take immediate action to avert the worst devastation outlined by scientists studying the climate, engaging in two weeks of civil disobedience in cities worldwide.

As part of the protests, activists projected a speech by Greta Thunberg onto the UK's Houses of Parliament.

This came a day before Queen Elizabeth is due to deliver a ceremonial speech from the House of Lords debating chamber on Monday (October 14).