An “incredible success” – that’s how a senior United Nations official has described bringing together 150 world leaders in Paris to discuss climate issues.

The heads of state and government have been attending the UN COP21 climate change conference at which the international community is expected to agree a universal deal to keep global temperature rises to below two degrees Celsius.

Janos Pasztor is the UN Assistant Secretary-General on climate change.

Cristina Silveiro asked for his impressions of the summit’s opening days.

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