On the second day of the summit, global leaders arrived in Glasgow to outline their climate commitments.
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British Prime Minister Boris Johnson (left) greets US President Joe Biden at the COP26 UN Climate Change Conference in Glasgow
The goal is to keep global warming limited to 1.5C, or at worst 2C, by 2100 but we are on track for 2.7C - which the UN says would result in "climate catastrophe".
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A summit organiser adjusts flags before the arrival of leaders
UK Prime Minister Boris Johnson and the UN Secretary-General António Guterres (below) were on stage to greet world leaders.
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Here are pictures of some of the 120 leaders who arrived on Monday.
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Prime Minister Boris Johnson (left) and France's President Emmanuel Macron
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European Commission President Ursula von der Leyen
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Prime Minister Boris Johnson (right) and German Chancellor Angela Merkel
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Prime Minister Boris Johnson (left), India's Prime Minister Narendra Modi (centre) and United Nations Secretary General Antonio Guterres (right)
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Slovakia's President Zuzana Caputova
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Prime Minister Boris Johnson (right) and Comoros' President Azali Assoumani
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The Prince of Wales and the Duchess of Cornwall
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Estonia's Prime Minister Kaja Kallas
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Scotland's First Minister Nicola Sturgeon (centre) with climate activists Vanessa Nakate (right) and Greta Thunberg (left)
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Prime Minister Boris Johnson (left), United Nations (UN) Secretary General Antonio Guterres (right) and Tanzania's President Samia Suluhu Hassan (centre)
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Prime Minister of the Netherlands Mark Rutte (right)
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Prime Minister Boris Johnson (left) and Palau President Surangel Whipps
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Prime Minister Boris Johnson (left), UN Secretary-General Antonio Guterres (right) and Iceland Prime Minister Katrín Jakobsdóttir (centre)
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Prime Minister Boris Johnson (left) and Nepal's Prime Minister Sher Bahadur Deuba
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Prime Minister Boris Johnson (left), United Nations (UN) Secretary General Antonio Guterres (right) and Montenegro's President Milo Djukanovic (centre)
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Gabon's President Ali Bongo Ondimba (left)
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Prime Minister Boris Johnson (left) and Antigua and Barbuda's Prime Minister Gaston Alfonso Browne
The meeting in Glasgow continues until 12 November.