Thunberg: 'If you choose to fail us we will never forgive you'

In an emotional address to the UN climate summit, the Swedish teenage climate activist Greta Thunberg warned of people dying, ecosystems collapsing and said we were on the brink of mass extinction. She accused world leaders of not doing enough. Also, President Trump says the scandal over a phone call with his Ukrainian counterpart is a "Democrat witch hunt", and we'll hear the claims about how seat belts and the temperature of an office can contribute to gender inequality.