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Sadly, human kind usually only sees value in nature when it has direct benefits to humans, as you point out like with medicinal plants. The first step is to discover these plants; here DNA Barcoding can help by speeding up taxonomic work. Once they are recognised, you have to know where they can be found, ie through ATBI projects. Especially if the plants are difficult to identify, DNA Barcoding can help here too. Once you know where they are you can protect those areas (ie from logging). If applicable, to prevent illegal trading you can DNA barcode processed plants which cannot be identified by normal means to catch the bad guys.
There are various ways in which DNA Barcoding can help, but it will not be the holy grail to conserving biodiversity
I thing we are only authenticate the biodiversity by means of Barcoding. isnt it?