Abstract
We are facing an unprecedented plant diversity crisis. If current trends in habitat conversion, over-exploitation, alien species invasions, and climate change continue, up to 50% of the world’s vascular plant flora is expected to become threatened with extinction within the twenty-first century (Pitman and Jorgensen 2002; Root et al. 2003; Hahns et al. 2009). Climate change seems to rapidly have become recognized as the primary threat to many plants. In Europe, more than half of the vascular plant flora may become endangered by the year 2080 as a result of climatic changes (Thuiller et al. 2005), and the first unfavourable trends in the threat status of plant species attributable to such changes have already been observed in successive Red List evaluations (Rassi et al. 2010). The Global Strategy for Plant Conservation (GSPC; Secretariat of the CBD 2002) was adopted under the Convention on Biological Diversity (CBD) in 2002 as a policy response to the dire situation of plant life, and an updated version of the strategy up to 2020 was recently approved at the Conference of Parties to the CBD in Nagoya (Convention of Biological Diversity 2010). Botanic gardens of the world, largely through their advocate Botanic Gardens Conservation International (BGCI), were pivotal in the writing and promotion of the GSPC, and have continued in this role in the implementation, follow-up, and further development of the strategy (Secretariat of the CBD 2009). The role of botanic gardens in the creation and mainstreaming of the GSPC has been a manifestation of the fact that these time-honoured institutions have fully adopted a fourth main task—conservation—alongside their traditional responsibilities in research, teaching, and public education in the field of botany. However, the GSPC puts due emphasis also on these traditional tasks through the recognition that successful conservation must be based on a solid knowledge base and that the understanding of the value of plant diversity must also be disseminated to the widest possible audience in order to make a difference
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