75% of the world's population will live in deadly heat.

Scientists are sounding the alarm for the survival of humanity at the end of this century.

About 30% of the world's population faces potentially deadly heat waves 20 days a year or more.

Scientists say today's heat is like a fast-spreading wildfire, and climate change drives the spread of this intense heat.

The study warns that if the Earth does not significantly reduce greenhouse gas emissions, especially carbon dioxide (CO2), three out of every four people in the world will be at risk of heat-related death by 2020, the study warns. 2100.

Another study published in the journal Nature Climate Change reveals another striking figure. Specifically, one in two people in the world will likely be exposed to deadly heat at least 20 days a year by the end of this century.

Notably, this problem will still occur even with a sharp reduction in greenhouse gas emissions; the study warns humanity that humans must learn to adapt to increasing temperatures on the planet.

Lead author of the study, Professor Camilo Mora, University of Hawaii (USA), said: "Heat waves are increasingly common on the planet, but in reality, our society does not care much about the severe consequences that it does to people now and in the future.

In 2003 in Europe, a big heat wave hit countries in this region, killing 70,000 people. The death toll is more than 20 times higher than the number of people who died in the September 11, 2001, terrorist attacks in the United States.

Or at the end of May, two countries, India and Pakistan, recorded dozens of deaths from the heat, with a record temperature of 53.3 degrees Celsius. In the United States, there were also deaths related to high temperatures in summer.

Alarm numbers

The study revealed that people living in humid tropics had a higher risk of death when the average temperature or humidity increased slightly.

"In particular, heat can be deadly even when temperatures are below 30 degrees Celsius, as long as they are combined with very high humidity," explains Professor Camilo Mora.

According to Professor Richard Keller, University of Wisconsin (USA), heat kills more people in the United States 10 times more than tornadoes or other natural disasters.

Young and older children are vulnerable because they lack support resources and are more socially isolated.

According to Richard Keller, during the European heatwave of 2003, the vast majority of those who died in the heatwave in France were 75 years or older and lived alone.

In addition, global average temperature warming also leads to increased social inequality, leading to many deaths due to heat peaks.

Which regions of the world will be affected?

Although heat waves are not considered a significant problem in India, Pakistan and southern countries, unprecedented heat waves are becoming more frequent and intense in these regions due to climate change. Queen.

In recent years, thousands of people have died from heat waves in India.

Another recent study published in the scientific journal Science Advances revealed that heat waves increased the number of deaths in India by 2.5 times compared with the 1960-2009 period.

Steven Davis, author of the study and a professor at the University of California (USA), said this increase is due to climate change.

However, India's average temperature has only increased by 0.5 degrees Celsius over the past 50 years, a more minor increase than in other parts of the world.

Surface air temperature measurements show a warming of one degree Celsius since pre-industrial times, but this increase is not evenly distributed.

In particular, the Arctic is experiencing an average increase of 2.5 degrees Celsius, and in November 2016, a large part of the Arctic Ocean recorded a record increase of 20 degrees Celsius.

Steven Davis points out that a slight increase in average temperatures can have significant consequences in tropical countries, especially for the highly vulnerable poor.

"In Chicago (USA), people can escape the heat, but this is not the case for many poor people in India," Davis explains.

He said This is climate change's impact on the ground, and it's not surprising now that there are about 60 deadly heat waves a year; rising temperatures are forcing people to leave their homes and migrate.

Professor Camilo Mora concludes: "For heatwaves, it is generally divided into two levels ', worst' to 'less bad', and many people worldwide have suffered the consequences of our actions. Failure to protect the environment leads to the planet being hurt."