Temperatures in cities will increase by 8 degrees Celsius by the end of the century

Under the dual effect of both global warming and urbanization, some cities around the world may have to witness an increase of 8 degrees Celsius by the end of the 21st century.

This has serious consequences for the health of the people in urban areas, causing companies and industries to lose skilled workers as well as pressure on increasingly capital resources. depleted, including water.

The above warning was published by scientists from the Netherlands Environmental Research Institute in the issue of Nature Climate Change issue on May 29.

To give this warning, scientists used data collected at 1,692 largest cities in the world between 1950 and 2015.

UHI significantly increases city temperatures and economic losses.

According to scientists, 5% of the world's most populous cities at the top of the rankings will have to see an increase of about 8 degrees Celsius or even higher by 2100.

The warming of the Earth will cause some cities to increase by nearly 5 degrees Celsius. The remaining cities will be affected by the Urban Heat Island (UHI) , which occurs when parks and ponds are affected. replaced by cement, asphalt, making these cities have a higher heat base than the surrounding areas.

Scientists have also combined different research results on the average warming of the Earth with the potential risks and impacts of UHI to assess future losses when cities become hotter. .

The annual economic losses of populated cities in the middle of the rankings are estimated at between 2.3-5.6% of the Gross Domestic Product (GDP) in 2100 and 1.4-1.7%. GDP by 2050. The most affected cities will likely suffer losses of up to 10.9% of GDP by 2100.

According to scientists, UHI significantly increased city temperatures and economic losses. Therefore, localities need to take action to reduce UHI, including planting more trees, using cooling materials to make roofs or sidewalks.

Although accounting for only about 1% of the Earth's surface, the economic efficiency of cities is very large, accounting for about 80% of the world's GDP and accounts for about 78% of energy consumption. These cities also emit more than 60% of carbon dioxide (CO ₂ ) due to burning coal, oil and fuel.