The World Meteorological Organization said global temperatures so far this year were 1.1 degrees Celsius above the pre-industrial average between 1850-1900, making 2019 one of the top three warmest years ever recorded.
The appeal by Inger Andersen, who heads the UN Environment Programme, and others came days before governments gather in Madrid for an annual climate change meeting.
President Trump got a step closer to pulling America out of the Paris Climate Agreement by sending a withdrawal letter to the United Nations, Secretary of State Mike Pompeo announced in a statement on Monday.
Some 60 world leaders gather at UN for a "climate emergency" summit aimed at reinvigorating the faltering Paris agreement, at a time when mankind is releasing more greenhouse gases into the atmosphere than at any time in history.
The recently-elected Bolsonaro government will embark on a process of privatising management of national parks amid criticism the government prefers economic development over conservation of environment.
Twenty warmest years "all in the last 22," scientists say in a UN report, with weather extremes in 2018 including wildfires in California and Greece, drought in South Africa and floods in Kerala, India.
The two-weeks COP24 conference in Poland's Katowice is billed as the most important UN conference since the Paris 2015 agreement on climate change.
Negotiators from countries around the world are in Poland for the annual UN Climate Change Summit which runs until December 14.
With only a single degree Celsius of warming so far, the world has seen a crescendo of deadly wildfires, heatwaves and hurricanes, a UN report says.
At current levels of greenhouse gas emissions, earth could pass the 1.5 C marker as early as 2030, and no later than mid-century, the Intergovernmental Panel for Climate Change reports with "high confidence".
A meeting of 195-nation Intergovernmental Panel on Climate Change in South Korea is vetting a major report that traces pathways for cutting global warming to 1.5 degrees Celsius. The bombshell 20-page report is due to be released on October 8.
UN climate talks in Bonn will begin on Wednesday. Even though the US said it will withdraw from the Paris agreement, it has sent a delegation.
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