An entire city has been burned, with at least hundreds of deaths reported in extreme heat in southwestern Canada and the northwestern United States. The average temperature in cities with a Norwegian climate is 50 degrees.
At the same time, heat waves are causing problems in Iraq and high temperatures in many parts of the world.
It was previously warned that if emissions were not reduced in this century, heat waves would exceed the limits tolerated by humans.
In the draft of the report to be published UN Climate Group In February next year, it was warned that it might happen soon. Heat waves that kill millions of people who have no chance of escaping the scorching sun.
If the temperature rises 1.5 degrees from the pre-industrial level, it is 0.4 degrees above the current level, with 14 percent of the earth’s population experiencing severe heat waves at least once every five years, the report said.
If you go up to half a degree, to the caller togradersmlet , Which will affect another 1.7 billion people.
Millions of cities in developing countries
The report said that big cities are growing in developing countries from Karachi, Pakistan to Kinshasa in the Congo, Manila in the Philippines and Lagos in Nigeria.
This is not the only degree of threat. Heat combined with high humidity is very dangerous. It makes the air around you a steam bath and can do the so-called calibration Wet ball temperature.
Experts believe that if the wet ball temperature is above 35 degrees, healthy people will not be able to survive even in the shade for drinking water.
– Colin Raymond, a leading researcher in a recent study on heat waves, says that when the wet ball temperature is too high, sweat loses its effect of removing excess heat from the body because there is too much moisture in the air.
– At some point, perhaps after six hours or more, if you do not have access to artificial cooling it can lead to organ failure and death, he says.
This means that heat waves with much lower temperatures than we currently see in Canada and the United States are more dangerous.
The elderly and the sick are particularly vulnerable to heat waves.
According to researchers at the London School of Hygiene and Tropical Medicine, 37 percent of global warming deaths are caused by climate change.
Many, including US President Joe Biden, have pointed to climate change as the cause of the heat wave in the United States and Canada.
Earth’s temperature has risen 1.1 percent since pre-industrial times. In the Paris Agreement, world leaders promised to keep temperatures below 2 degrees, preferably 1.5 degrees.
30 dangerous days a year
Despite that goal, the UN report warns that millions of people in major cities in Africa and Asia will be affected by at least 30 dangerous hot days a year by 2080.
“In these regions, urban populations are growing dramatically and the threat of catastrophic heat is looming,” said Stephen Lohre, lead researcher in the study cited in the report.
His calculations do not take into account the metropolitan effect, which means that the temperature of a large city is on average 1.5 degrees higher than the heat wave. This occurs because asphalt and buildings absorb heat, while density and other factors come into play.
Particularly vulnerable is sub-Saharan Africa.
– This is the center for heat waves, says Luke Harrington, a researcher at Oxford’s Climate Institute.
In Central China and Asia, wet ball temperatures are expected to reach dangerous levels, the UN report warns.
The difference between Europe and North America
The Mediterranean can also be affected by deadly heat waves, and 200 million Europeans will be exposed if temperatures rise by 2 degrees.
Researchers believe that North America, which is now experiencing a heat wave, is actually the best at dealing with it.
– Because most buildings in North America are air-conditioned and well-insulated, modern buildings. Jeff Stanave, a researcher at the global health organization IHME, says there is a difference in infrastructure.