We're running out of time to stop climate change - the warning from the weather agency of the United Nations.
The World Meteorological Organization says carbon emissions increased 20 percent in the past four years, which are on track to be the hottest on record.
The warning coincides with world leaders meeting in New York for a major UN climate conference.
And as ice sheets are melting faster than before, causing sea levels to rise by five milimetres a year.
Scientists warn that even if every country meets the carbon emission cuts agreed in the Paris climate agreement in 2015, the world will still be three degrees warmer.
The warnings of catastrophe have provoked millions of young people to protest world-wide.
Greta Thunberg, the Swedish teenager who inspired the largest ever mass marches on climate change, says young voices must be heard - and adults must take action to protect everyone's future.
Are the world's leaders listening?

Presenter: Imran Khan
Guests:
Sharon George - Senior Lecturer in Green Technology and Environmental Sustainability, Keele University
Clare Farrell - Co-Founder, Extinction Rebellion activist group
Simon Alcock - Head of Public Affairs and Campaigning at Client Earth, a non-profit environmental law organisation

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