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Découvrez comment un gigantesque « dôme de chaleur » venu du Sahara submerge l'Europe, provoquant des records de température, des infrastructures en détresse et des événements extrêmes. Les experts tirent la sonnette d'alarme sur les effets du changement climatique qui transforment nos étés en véritables défis climatiques.

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00:00The East Europe is in full wave of historic heat.
00:04Some places have reached 44 degrees Celsius.
00:09Six countries have caused their high-alerte canicule level.
00:13The lives are in play.
00:15And the reason could be much more complex than we think.
00:19France has placed the most part of the country in red alert.
00:23The national average temperature has reached 30 degrees Celsius.
00:26It is not extreme, but it is the average on all the territory, day and night.
00:32By the place, the thermometer has reached up to 43 degrees.
00:37The heat was such that two of the most famous monuments of Paris,
00:41the Museum of the Louvre and the Tour Eiffel,
00:44had to close before.
00:45These buildings are not simply designed to support such a heat.
00:50More half of France is placed under the high-alerte canicule level.
00:54The most high-alerte canicule.
00:55Hundreds of thousands of houses have been deprived of electricity.
00:59The risk of incendies is considerable.
01:02And the firefighters have already fought against the forest fires.
01:06Since the beginning of the canicule,
01:08at least 40 people have lost their lives.
01:11The rest of Europe is not even worse.
01:14The European Union has recorded one of its June's months the most hot.
01:18The previsionists announced that the temperatures could reach 38 degrees per place.
01:23Some cities have closed schools,
01:26the classrooms are becoming invisible.
01:28The electric networks have been feeding all the climatizers and ventilators.
01:33The hospitals treat more and more patients victims of the heat.
01:39The most high-alerte canicule is the highest temperature.
01:44The most high-alerte canicule is the highest temperature.
01:45In May, 101 people have lost their lives because of the heat.
01:49A record for this month.
01:51The Italy is facing the same problem.
01:54A large part of the country is under the highest-alerte canicule level.
01:57The most high-alerte canicule.
02:01Some regions of Germany redoutent the sächeress.
02:05The local authorities have asked the inhabitants to economize the water,
02:08because the reserves could be quickly if the canicule persists persist.
02:12And the danger is not there.
02:14The rain is dry and the forest s'enflammes very easily during a canicule.
02:18Some countries have already allowed the barbecues to reduce the risk of incendies.
02:23The Bays-Bas have also warned the population to prepare themselves.
02:27The meteorological services have issued an orange alert,
02:31meaning a imminent danger meteorological imminent.
02:34The temperatures could climb up to 39 degrees.
02:38The Belgium is facing almost identical.
02:41A large part of the country is under the orange-alerte canicule,
02:45with temperatures able to reach 37 degrees.
02:48The scientists alert us for decades.
02:51As long as the gas to air flow accumulates in the atmosphere,
02:55they retain more solar heat,
02:57like if we added a additional cover of the Earth.
03:00This excessive heat should go somewhere.
03:03And Europe is becoming the one of the regions
03:05which heat up the most quickly on the planet.
03:08In average, Europe heat up about two times more quickly than the rest of the world.
03:12This means that the canicules like these,
03:14will become more frequent.
03:16They will take longer and will reach even higher temperatures.
03:21You may be wondering why Europe is so often touched.
03:25We could believe that all the planet is heating up at the same rate.
03:29However, Europe is heating up faster than any other continent.
03:33The global temperature has increased about 1,4 degrees Celsius
03:38since humanity has started to burn massively carbon,
03:42oil, oil and gas.
03:45Europe, she, has been heating up to about 2,4 degrees Celsius.
03:50One part of the explanation is surprisingly simple.
03:53Europe has much more than the Earth than the ocean.
03:56And the Earth is heating up much faster than the water.
03:59When you walk on a beach in summer,
04:02the sand burns your feet,
04:03while the ocean just next to the side is still cold.
04:06The water can absorb a huge amount of heat
04:09without really rising in temperature.
04:11The Earth, no.
04:14Europe is also too far from the Arctic.
04:16And the Arctic changes at an incredible speed.
04:19Normally, the snow and the ice act like a gigantic mirror.
04:24They envoie a large part of the solar energy into space.
04:28But with the height of the temperatures,
04:30this snow and the ice melt.
04:32In the middle of the sea,
04:34there are dark and oceanic clouds.
04:36These more dark surfaces absorb much more light light,
04:40which amplifies the heating.
04:42This additional rain makes more and more ice melt.
04:46And this vicious circle is repeated without end.
04:49There is another factor that no one thinks.
04:52Europe has significantly reduced its air
04:55by reducing the pollution of the factories and the centrales.
04:58And it's an excellent news for our lungs.
05:01But a part of this pollution had a significant effect.
05:04It's an unexpected effect.
05:04It's bringing a little light light into space.
05:08Today, the air is more pure.
05:10And more rayons will reach the ground.
05:13This effect is modest compared to the gas to the air.
05:15But it adds still a little bit of heat.
05:18In other words,
05:19in this moment,
05:20a vast zone of high pressure station
05:22on the top of the Europe of the West.
05:24The meteorologists call it a dôme of heat.
05:26Imagine a huge salad in water
05:29return to a city by big sun.
05:32The air chaud in the bottom
05:33can practically not escape.
05:36At the same time,
05:37this high pressure system
05:38pushes the air towards the bottom.
05:40When we compress the air
05:41in a reduced space,
05:42it chauffe,
05:43exactly like a bike pump
05:45which is hot when we use it.
05:48This high pressure also attacks the clouds,
05:50as well as the sun hits the ground
05:53from the morning to the evening.
05:56And there is still a last piece of the puzzle.
05:59Recently,
06:00the winds have aspirated
06:01the air even more hot
06:03coming from the Sahara.
06:04The dôme of heat
06:05has then pushed this air
06:07above the Europe,
06:08creating the worst combination possible.
06:12The air burning
06:13in Africa,
06:14a continuous sunlight
06:15and a giant cover
06:16in the atmosphere
06:18that keeps all this heat
06:19heat.
06:21We have to wait
06:22until the next five years
06:23beat even more
06:24record of heat.
06:25What was before
06:27an exceptional rain
06:27is becoming a normal winter.
06:31The European cities
06:32are they ready?
06:34It's a major problem.
06:36The rain
06:36has more people in Europe
06:37than the inundations,
06:39the fires of forest
06:40or the storms.
06:41According to the World Health Organization,
06:43every year,
06:44more than 175.000 people
06:46are in Europe
06:47of causes liées
06:48to the rain.
06:49However,
06:50the authorities
06:51never treat
06:51the extreme rain
06:53as other natural disasters.
06:55Often,
06:57they only react
06:57only once
06:58the temperatures
06:58become dangerous.
07:01Contrairement
07:02to the hurricanes
07:02or the inundations,
07:04many countries
07:05still have no plans
07:05long term
07:06to face the heat.
07:08Fortunately,
07:09things change.
07:10Last year,
07:11the United Nations
07:12have developed
07:12a new world plan
07:13to help countries
07:14to prepare
07:15extreme weather.
07:16The main goal
07:17is to treat
07:18the rain
07:19as real disasters
07:20and not
07:21as simple
07:22day
07:23of winter
07:23a little cold.
07:26But
07:26transformer
07:27the cities
07:27themselves
07:27is much more difficult.
07:30Europe
07:30has passed
07:31centuries
07:31to build roads,
07:32buildings
07:33and public spaces
07:34for a more cold climate.
07:35Some roads
07:37have been traced
07:37before the invention
07:38of the automobile.
07:40Nobody
07:40imagined
07:41the summer
07:42to more 40 degrees.
07:43No one
07:44has built
07:45the cities
07:45to resist.
07:47They
07:48are surrounded
07:54like
07:55windows
07:56like
07:56red
07:58ice
07:59and
07:59slowly
08:00then
08:00slowly
08:01after the
08:03sunset
08:03the
08:03sunset
08:03C'est pourquoi traverser le centre d'une ville par une soirée chaude peut sembler
08:08pire que de se tenir en pleine campagne au même moment.
08:12Même après le coucher du soleil, la chaleur n'a nulle part où aller.
08:17Dans beaucoup d'endroits, les centres-villes restent jusqu'à 4 degrés plus chauds que
08:21les quartiers alentours. Pour y remédier, Paris prévoit de planter environ 170 000
08:27arbres afin de créer davantage d'ombre.
08:31Marseille arrache le bitune de certaines places anciennes pour le remplacer par des
08:36végétaux et de la pelouse. D'autres villes peignent leurs rues avec des couleurs
08:41claires pour réfléchir davantage de lumière au lieu de l'absorber. Certaines modifient
08:46les normes de construction pour que les nouveaux logements restent plus frais et
08:49dépendent moins de la climatisation. Mais jusqu'ici, c'est un peu comme mettre un
08:54pansement sur une jambe cassée. Le vrai problème n'a pas disparu.
08:59L'Europe brûle encore chaque jour d'énormes quantiqués de pétrole, de gaz et de charbon.
09:05Voiture, avion, usine et centrale continuent d'envoyer des gaz à effet de serre dans l'atmosphère.
09:12En moyenne, une personne dans l'Union européenne est responsable d'environ 10 tonnes de gaz à effet de serre
09:19par an, alors que la moyenne mondiale n'est que d'environ 5 tonnes et demie.
09:24Dans bien des cas, il revient encore moins cher de prendre l'avion que le train.
09:28Les villes manquent toujours de centres de rafraîchissement où les gens peuvent échapper à la chaleur dangereuse.
09:34De nombreux bâtiments récents pourraient devenir invivables d'ici quelques décennies.
09:40Et beaucoup de personnes âgées vivant seules ne bénéficient toujours pas de visites régulières pendant les canicules,
09:46alors qu'elles sont les plus vulnérables.
09:50L'Union européenne prévoit de déployer une nouvelle stratégie climatique d'ici fin 2026.
09:56Elle est censée aider les pays à se préparer à des conditions météorologiques plus extrêmes.
10:01Ce qui est alarmant, c'est que le climat change bien plus vite que l'Europe ne s'adapte,
10:06et chaque été, cet écart se creuse un peu plus.
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