4.11 - 1251 ratings - Source

... in ekostelsels; voedsel- kettings; biogeochemiese kringlope (water, koolstof, stikstof, ens) word noukeurig verduidelik, ... He addresses these issues aquot;in the knowledge that what is needed is not an encyclopaedia but a desk-top guide that can be consulted and acted upon easilyaquot;. ... other things, we need informed and aware citizens, sympathetic and earth-caring leaders and well-trained scientists.

Publisher: - 1990

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