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Recherche

Apprenez à jardiner dans le respect de votre environnement, un site de la SNHF
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Création de Jacques Castagné (D.Ronflard)

Jardine avec Bottine et ses amis. de 3 à 11 ans

Environnement : essai d'une chronologie générale

Pour bien comprendre les problématiques environnementales actuelles et à venir, il est bon de se remémorer les grandes étapes de l'évolution de notre planète, depuis la création de l'univers il y a 15 milliards d'années.

LES GRANDES ETAPES DE L'EVOLUTION DE NOTRE ENVIRONNEMENT

-15 milliards d’années : Big Bang (« naissance » de l’univers)

- 6,5 milliards d’années : « naissance » de la Terre

- 3,8 milliards d’années : traces d’apparition de la vie sur la Terre (côtes du Groenland)

- 579 millions d’années : traces d’apparition des premiers organismes pluricellulaires

- 439 millions d’années : 1ere crise d’extinction massive d’espèces (disparition d’invertébrés marins)

- 365 millions d’années : 2eme crise d’extinction massive d’espèces (disparition de vertébrés marins)

- 250 millions d’années : 3eme  crise d’extinction massive de 90% des espèces terrestres et aquatiques (disparition des Trilobites)

- 240 millions d’années : 4eme criss d’extinction massive d’espèces (reptiles mammaliens)

- 65 millions d’années : 5eme crise d’extinction massive d’espèces (disparition des Dinosaures et des Ammonites) à la suite probable de la chute d’une grosse météorite dans le nord du Yucatan

- 2,7 millions d’années : traces d’apparition des Hominidés

- 2 millions d’années : début d’une vingtaine de cycles glaciaires de 100 000 ans chacun (interglaciaires de 10 à 20 000 ans)

- 10 000 ans : début d’un réchauffement climatique

Pour lire la suite, TELECHARGEZ L'ARTICLE EN PDF

Portrait de Daniel LejeuneDaniel Lejeune
Ex Directeur de l'écologie et de l'environnement de la ville de Bourges

acheter les actes du colloque Quand les plantes se parlent