How to adapt the city to heat peaks in videographic. VIDEOGRAPHIC
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00:00Whatever the season, it's always warmer in the city centre than in the countryside, especially at night.
00:12Heat absorbed during the day by buildings and road surfaces is released when the sun goes down.
00:17This is known as the urban heat island phenomenon.
00:20As a result, on average there's a difference of between 2 and 3 degrees
00:24between nighttime temperatures in a city centre and in the countryside.
00:28With a heat wave, that difference can reach 10 degrees.
00:31There are lots of things cities can do to adapt to climate change.
00:34One is to harness the reflecting power of materials covering the surfaces of walls and roofs of buildings.
00:40This albedo effect of high-reflecting paints and ceiling joints can bring the temperature down by 1 to 3 degrees.
00:47By painting roads and buildings white, gains of up to 10% at ground level can be made.
00:53Making towns greener is essential as well.
00:56Green roofs and the creation of gardens where trees provide shadow and maintain correct levels of evapotranspiration.
01:05Roads can be hosed down, in particular with sprinkler systems integrated into pavements.
01:10Asphalt should be abandoned in favour of porous surfaces like paved roads,
01:15which make it possible for water to seep through into the soil.
01:19Install more fountains.
01:20Water evaporation contributes to a drop in ambient temperature through the generation of cool pockets.
01:27Put the wind to work by encouraging the free flow of air between buildings,
01:31thereby preventing hot air from stagnating.
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