A growing number of governments, cities and businesses understand that climate solutions can strengthen economies, improve air quality and public health and protect the environment, he said. "We expect initiatives in a diversity of sectors, such as energy, sustainable agriculture, forests, oceans and resilience to climate impacts."

The summit will emphasize the importance of a just transition, where no one is left disadvantaged by necessary climate action, he said. "It is clear that a transformation is under way, but it clear that it is not as quick as needed."

New technologies are already delivering energy at a lower cost than the fossil fuel-driven economy. Solar and onshore wind are now the cheapest sources of new power in virtually all major economies, noted Guterres.

He asked for an end to subsidies for fossil fuels and high-emitting, unsustainable agriculture and for a shift toward renewable energy, electric vehicles and climate-smart practices.

He also asked for carbon pricing that reflects the true cost of emissions, from climate risk to the health hazards of air pollution.

By making this transition, the world can avert the threat of irreversible climate disruption and march far down the road to realizing the 2030 Agenda, said the UN chief.

He saw a clear link between climate change and security.

"It is clear that natural disasters ... are causing massive displacement, and this displacement will inevitably increase migration flows. And, at the same time, impacting on productivity and agriculture, it will make hunger much riskier and it will create factors of social instability."

There are interesting analyzes about the links between weather evolutions and political issues in history, he said.

"I recommend some interesting analyzes about the weather evolution before the French Revolution and some analyzes -- very interesting analyzes -- about the impacts of droughts in relation to the Arab Spring," he said. "I'm not saying that this means that there was climate change in all these circumstances. ... But it is clear that there is a link, a very clear link, between climate and security, between climate and stability, between climate and well-being of populations."

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