The article, Nearly 1/3 of world's cacti species facing extinction, published by the University of Exeter in 2015, mentions a very big theme, which is occuring right now in science and which has to be stopped: EXTINCTION.
The article is talking of how endangered the cacti are through human influence. Cacti belong to the autotrophs, which produce their own food, therefore they are very independent and humans don't use them as consumers because it doesn't belong to their normal food supplies, wherefore that can't be the reason for their progressing extinction.
The cacti do as well as the humans belong to the biotic factors in our ecosystem because they are living and because they live they have to be protected so that there is a larger variety of species.
Cacti are sustainable communities which means that they can live without that resources are shortened after a while, so the aren't a problem for the environment. Instead it is the human who is a thread to the cactus, because we take their space through agriculture, remove them from their normal habitats to trade with their seeds, which is illegal and therefore shouldn't be done anyways.
http://www.enn.com/wildlife/article/49062
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