How to adapt the city to heat peaks in videographic. VIDEOGRAPHIC
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00:00 What is the difference between daytime and nighttime?
00:05 Whatever the season, it's always warmer in the city centre than in the countryside, especially at night.
00:11 Heat absorbed during the day by buildings and road surfaces is released when the sun goes down.
00:16 This is known as the urban heat island phenomenon.
00:19 As a result, on average there's a difference of between 2 and 3 degrees between nighttime temperatures in a city centre and in the countryside.
00:27 In a heat wave, that difference can reach 10 degrees.
00:30 There are lots of things cities can do to adapt to climate change.
00:34 One is to harness the reflecting power of materials covering the surfaces of walls and roofs of buildings.
00:40 This albedo effect of high reflecting paints and sealing joints can bring the temperature down by 1 to 3 degrees.
00:47 By painting roads and buildings white, gains of up to 10% at ground level can be made.
00:53 Making towns greener is essential as well. Green roofs and the creation of gardens where trees provide shadow and maintain correct levels of evapotranspiration.
01:03 Roads can be hosed down, in particular with sprinkler systems integrated into pavements.
01:10 Asphalt should be abandoned in favour of porous surfaces like paved roads, which make it possible for water to seep through into the soil.
01:19 Install more fountains. Water evaporation contributes to a drop in ambient temperature through the generation of cool pockets.
01:27 Put the wind to work by encouraging the free flow of air between buildings, thereby preventing hot air from stagnating.
01:35 [Silence]