Deadly Heat The Cooking Cities. Here’s How to Cool Them Down
If you really are driven from the country to the city and amazed at how fast the temperature rose, you felt the effect of the heat on the urban island. The streets and buildings of a metropolis absorb the energy of the sun during the day and gradually release it at night. The built environment cause self -cooking, and temperatures can rise up to 20 degrees Fahrenheit higher than in the neighboring country, which benefits from many trees “sweat,” which releases water vapor and cools the air.
As global temperatures rise rapidly, scientists, governments, and activists are scrambling for ways to overcome the island’s effects of heat. Agreed to World Health Organization, the number of people exposed to heat waves jumped to 125 million between 2000 and 2016. Extreme heat is killing more Americans than any other natural disaster, and is more dangerous for people with conditions similar to the first asthma.
By 2050, seven out of 10 people will live in cities, according to World Bank. That’s a whole lot of burning people. “I really see towns as a kind of canary -class coal mine situation, where there’s very little bit of detail to what the other planet will experience,” said Portland State University’s climate adaptation scientist. Vivek Shandas, who studied the island’s effect of heat in more than 50 U.S. cities.
Shandas ’research shows that even within towns, one neighborhood can be 15 degrees warmer than another, and that’s disparate maps of income inequality. A key predictor of heat in a neighborhood is how much green space it will have. The richer parts of a town tend to have more crops, and the poorest parts. there is a lot of concrete; they are rapidly developing, and are filled with numerous box stores, freeways, and industrial facilities that read in the sunlight. A concrete scene is very good at controlling the heat, in fact, it will keep it warm at night. When the sun rises, a poor neighborhood is hotter than a rich neighborhood.
Scientists are just beginning to study whether they can lower the temperature of city structures by installing “cool” roofs, walls, and asphalt – colors that are light in color and repel sunlight. Light faces reflect more sunlight than dark faces. (Think about how you feel while wearing black instead of white on a sunny day. This effect of albedo is also part of the reason why the Arctic very hot.) But while the thermodynamics are straightforward, the transmission of cool surfaces has become a surprisingly complex one.
Take away the problem of cooling roofs, says environmental engineer George Ban-Weiss, who studies cool infrastructures at the University of Southern California. In theory, it is simple to paint large, flat tops of commercial buildings white or light gray. Homeowners can opt for lighter tiles-the usual old clay, in fact, shows up very well in the sun’s rays. These changes can cool the air coming from the roof, as well as the structure itself, meaning the occupants don’t have to run the aircon constantly. If a building can support the excess weight, owners can even create a roof garden filled with plants, which will cool the entire area by releasing water vapor.
Even if the changes it will make will make life more life-threatening for the people inside each renovated building, if there are enough owners following, in some areas it may have no intended regional impact. In a coastal metropolis like Los Angeles, urban warmth is often the opposite of ocean cold, a difference that drives reliable sea breeze. As land and sea temperatures get closer to each other, there may be less air. “That’s why that means less clean air coming into town, which can create a much higher concentration of pollution,” Ban-Weiss said, adding to the loss of air that cools people down.