Prime Minister Boris Johnson and Sir David Attenborough have met at the Science Museum as part of an event to launch key UN climate talks in the UK.
The pair are attending the event in London to mark the 2020 United Nations Climate Change Conference, which is taking place in November.
The prime minister, who will use a speech to call for international efforts to reach net zero as early as possible, told school children at the event: "We are trying to get people focusing on what this country is doing to tackle climate change and how to reduce carbon dioxide emissions, which as I understand it is swaddling the planet like a tea cosy."
It came as Claire O'Neill, the recently sacked president of a major UN climate summit set to be hosted by the UK, accused Mr Johnson of a lack of leadership over climate change and "apparent dark ops" over her dismissal.
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