"Every bit of warming matters. Every year matters. Every choice matters. With this report, the scientific message is clear. It is now up to you, the governments, to act," he said.
Petteri Taalas, secretary-general of the World Meteorological Organization, also warned that current levels of greenhouse gas emissions were unsustainable, and were already leading to dramatic climate change impacts around the world, from the melting of Artic ice to many incidents of fires and flooding this year.
"We are expecting a 2 to 4 percent increase in global carbon dioxide emissions this year. If we are serious about the Paris Agreement, we need to see different numbers," Taalas said.
The secretary-general also pointed out that even if pollution of the atmosphere is stopped today, the current levels of CO2 would stay in the atmosphere for many years to come, locking in extreme weather.
The UN climate conference came as latest reports show that climate challenges remain undeterred and global carbon emissions are set to hit an all-time high in 2018.
According to a report released last week by the University of East Anglia (UEA) and the Global Carbon Project, global carbon emissions are expected to rise by more than 2 percent from last year to 37.1 billion tonnes of CO2 in 2018, driven by a solid growth in coal use and sustained growth in oil and gas use.
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