No offense but that is bunk. To grow thousands of olive trees indoors would be nearly impossible. Perennial crops like this need huge amounts of soil for their

No offense but that is bunk. To grow thousands of olive trees indoors would be nearly impossible. Perennial crops like this need huge amounts of soil for their root systems, and to replace the amount of olives with indoor plantation would require a massive square footage of greenhouses. Not to mention that diseases like this can just as easily transmit indoors. Look into the American chestnut blight if you don't believe me. There almost no way to grow a tree isolated from the blight. The only viable solution in cases like these is a genetic one. In this case, we can actually top the olive and graft a disease resistant variety onto the rootstock. In some cases you may have to actually develop an entirely new tree from scratch and replant. That is why continuous research into plant genetics and breeding is so extremely important for the continuation of human society.