How to cool down the cities?

Here are the ideas that cities have to fight heat waves, they often involve urban policies to reduce energy consumption, pollution, heat dissipation, … Between 2018 and 2050, the part of the world population present in the cities will go from 54% to 66%.

Cover pavement, roads and sidewalks with a light gray coating, with a temperature drop of up to 10 degrees Celsius !

Cover the roofs with a white or clear coating, with an incredible drop of up to 20 degrees Celsius ! A significant reduction in electricity consumption, as buildings have less need to cool down. We see more and more buildings and houses totally painted white.

Plant tens of thousands of trees each year. Each tree will capture a quarter of the CO2 particles within a 30-meter perimeter. They release water vapor and their leaves filter the air. It is then necessary to create water irrigation corridors in cities to feed these plants.

Transform buildings into garden buildings. It involves growing crawling trees along the balconies, redeveloping the buildings to facilitate the growth of plants on their façades. But also to set up vegetable gardens with vegetables and fruits.

Create wind corridors in cities. By rethinking the axis of the streets, the air must be able to pass easily through large axes and not be cut directly by large blocks of concrete.

Build giant towers to clean up the air and water. It involves putting filters in the frame of large towers so that the air is filtered from its particles. Likewise for water.

Place solar panels on the roofs of buildings. They would then reduce the electrical cost of air conditioning. But they will also capture the heat through their black panels, while turning it into electricity.

Install solar chimneys. Based on the famous chimneys that cool the air in the Maghreb and the Middle East, they consist in using a pressure difference between the room to ventilate and the outside. The height of the chimney allows a stratification of the temperature, the wind will then generate depressions, just like the temperature difference the inside and the outside. There is thus a circulation of hot air to the cold air.

Set up oxygen and water sprays in the cities centers to refresh the tourists. This would imply better water management.

Replace the concrete with new materials. The problem of concrete, plaster, stone is that they are non-porous materials that capture and retain heat, which is perfect in winter but problematic in summer. This adds at least 3 degrees Celsius inside the buildings. It would require a material that redistributes heat to the foundations.

Create parks and other green spaces to cut heat stored in the concrete and the tarmac which are increasingly interconnected in cities. We could also limit the tar and the walkways and replace them with soil.

Create an Internet by satellite with better speeds to push people to stay in small towns or to push them to return to the countryside and limit concentration in the big cities, thanks to teleworking.

Reduce the movement of city dwellers by facilitating daily services, allowing them to do everything from a home.

Create tolls at the entrance of cities to limit the flow of cars. Prohibit the use of the most polluting vehicles.

Build wind towers that will ventilate the streets of the city. The cities would produce their own wind. The tower sucks the hot air of the streets and evacuate it high in the sky. There is indeed a convection of air currents that is produced by the tower. This allows to lower the temperature of about 5 degrees Celsius on a public place.

Avoid the construction of skyscrapers, which have difficulty in evacuating heat unlike small buildings.

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