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SVT 4 Rechaufclimat

SVT 4eme Rechauffement climatique

Quels sont les signes du rechauffement climatique? inondations, secheresses, fonte des glaciers aux poles, elevation niveau de la mer
Nommer 3 gaz a effet de serre CO2 (dioxyde de carbone), CH4 (Methane) et H2O (vapeur d'eau)
Decrire comment les gaz a effet de serre cause le rechauffement climatique 1) Terre absorbe UV du soleil; 2) Terre emet IR 3)Gaz a effet de serre absorbent IR; 4 et re-emettent les IR en direction de la terre; plus de CO2=moins de IR quittent la Terre
Quelles sont les activites humaines qui augmentent le taux de CO2? Combustion d'energies fossiles (gaz, charbon et petrole), deforestation
Quelles sont les activites naturelles qui augmentent le taux de CO2? Volcans, feux de forets
Quelles sont les activites naturelles qui reduisent le taux de CO2? Plantes (photosynthese); Oceans (absorbtion); formation de roches calcaires (carbonate calcium)
Decrire comment tu peux reduire ta contribution a l'augmentation de CO2 Reduire consommation energie; (douche plutot que bains; ampoule halogenes); utiliser public transport
Decrire comment les gouvernement peuvent reduire la contribution a l'augmentation de CO2 Encourager les energies renouvelables; encourgaer production vehicules electriques
Y a t il une correlation entre taux de CO2 et augmentation de la temperature globale? Oui on peut dire plus le taux de CO2 augmente, plus la temperature globale augmente MAIS cette relation n'est pas valable tout le temps: certaines annees la temperature globale diminue bien que le taux de CO2 augmente