This conference is being held at a time of mounting concern for the future of the plant kingdom. Estimates based upon the Red Data Book research and on surveys of threatened plants in North America, Europe and other parts of the world suggest that perhaps one-tenth of angiosperm species are in hazard of extinction, a situation a good deal worse than might have been predicted even ten years ago. Some floras are in greater peril than others, but there are few major ecosystems not now at risk in some degree. The cause is easily identified: natural events, including climatic shifts, certainly account for some of the changes in species abundance and distribution now being observed, but the major pressures arise from the manifold activities of Man.
KeywordsBotanic Garden Plant Kingdom Climatic Shift Angiosperm Species Living Collection
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