The extinction of animal species gets the most press coverage, but plant species are also in danger. This probably deserves a bit more attention since so much of life is dependent on plants. (And it’s not just as a food source; plants are also responsible for turning carbon dioxide into free oxygen. We might miss that when it’s gone.)
The government of Norway has established a Seed Vault. That way in the event of a global disaster, it may be possible to restart the world’s agricultural systems.