@MrsPramm - It shouldn't be about economic reasons though. The diversity of vegetation on planet Earth needs to be conserved because diversity is a good thing in itself, rather than because it's a good thing economically.
One of the best initiatives in the world at the moment are the different versions of seed banks that are being developed to attempt to save as many plants as possible. People call them gifts for the next generation, but honestly, heritage is not a gift. It's a right and the fact that we have to take extra steps to preserve it is a travesty.