"What I want is to have the whole of society putting pressure on governments to make governments understand they need to run faster, because we are losing the race," he said, adding: "What the science tells us today is that these targets are still reachable."
Guterres said that inaction by some key countries, including the US, could be at least partly offset by action at the sub-national level, for example in the carbon neutral pledges made by the states of California and New York.
"I think one of the best things of the US society is the fact that it is a federal country... that decisions are decentralized, so I will be always very strongly in favor of keeping decisions on climate change as decentralized as possible," he said.
He noted that major cities, regions and businesses were taking over, and that banks and investment funds were pulling out of the coal and fossil fuel sectors.
Guterres also cited the example of the European Union, where only three countries now oppose the goal of carbon neutrality by 2050, and said that he felt a "new wind" in the push for renewable energy, especially with the growth of solar in India and China.
Failure to meet the goals laid out under the Paris agreement could lead to the crossing of so-called "tipping points" such as the thawing of the Earth's permafrost that further accelerate warming, creating a situation where extreme weather events become the norm.
Guterres said he was heartened by growing societal awareness, which meant that hope was not yet lost, "but that requires profound changes in the way we produce food, in the way we power our economies, in the way we organize our cities, in the way we produce energy."
"I feel that more and more people, companies, cities, and governments, are understanding that needs to be done," he said.
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