Heat stress is one of the greatest threats facing humankind. Higher temperatures can also reduce the work capacity of people, especially in agriculture, resulting in tens of billions of hours of work capacity loss each year.

According to the authors, the most disturbing is the aggravating effect of extreme weather events. which are exacerbated by climate change. According to the report, heat waves, floods and storms can affect public health systems that are supposed to help people. A lack of emission limitation, he warns, could lead to disasters that "disrupt the basic infrastructure of public health and overload health services."

The US report, titled National Climate Assessment, indicates that extreme rainfall could overwhelm the population. The country's troubled water and sewer systems contribute to the shortage of drinking water and increasing exposure to gastrointestinal diseases. In some areas of the country, such as Florida and Texas, higher temperatures will benefit a type of mosquito that transmits the viruses that cause dengue, Zika, chikungunya and yellow fever.

Echoing these warnings Wednesday, UN Secretary-General António Guterres urged world leaders to quickly reduce greenhouse gas emissions as they promised in the of the Paris climate agreement, three years ago. According to the World Health Organization, nine out of ten people breathe unsanitary air, Guterres said. "Respecting the commitments of the Paris Agreement could save more than a million lives a year," he said.

Reducing emissions from sources such as coal-fired power plants and diesel trucks would also bring significant savings to public health. systems, say the Lancet authors. "Doing this now would be good for us, for our livelihood and for the planet," said Dr. Ebi.