**4.3 Prospects**

At least, 28,187 plant species are currently recorded as being of medicinal use in the world; however, only 4478 of the species used in plant-based medicines are cited in a medicinal regulatory publication [12]. It means a huge possibility to find new drug in the future. The global market of herbal medicines is glowing year by year with the interest in natural medicine. According to estimation of the World Health Organization in 2003, the annual global market for herbal medicines is reported to be worth US\$60 billion and by 2012 the global industry in Traditional Chinese Medicine (TCM) alone was reported to be worth US\$83 billion [12].

However, human surviving and development of new drugs is as a result of existence of medicinal and aromatic plants. Sustaining the plant species and conservation of genetic resources is the most priority role of human changing with the circumstances of earth. Climate change already causes a serious state for plants throughout the world. A research group assessed late twenty-first century distributions for 1350 European plants species under seven climate change scenarios. As a result, more than half of the species could be vulnerable or threatened by 2080 [14]. As is generally known, some countermeasures against climate change need an enduring cooperative effort from national and international interdisciplinary researchers.
