Desertification

There are pressures from farming at the edges of the desert. Pastoral nomads with their overgrazing and over-cultivation are also actively extending the deserts.

     Irrigation

For thousands of years farmers have used simple technology to supply water to their fields, having little lasting impact on the environment. Irrigation using modern technology can result in greater commercial production of economic plants. However, in the process this lowers water levels, increases salination and changes the nature of the natural vegetation.

     Introductions

Opuntia plants were moved from South America to Australia, but with no natural enemies it became an invasive weed. A moth was eventually introduced from its native habitat to act as a natural biological control.

     Decoration

Succulents are being removed from the wild to be used as garden and house plants. Cacti collectors also pose a considerable threat if plants are removed illegally without thought to the natural environment.

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