Ecological problems

Contamination of atmosphere enterprises. Disappearance of the forests and violation of oxygen balance. Extinction of rare varieties of animals, birds, fishes, drying up of the rivers and lakes. Maintenance of life on a planet for future generations.

Рубрика Экология и охрана природы
Вид презентация
Язык английский
Дата добавления 31.10.2013
Размер файла 220,2 K

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