What on earth are the eugenicists preparing for with a doomsday seed vault?

From the Corbett Report

What on earth are the eugenicists preparing for with the doomsday seed vault? Why does humanity need a backup of millions of seed varieties that have presumably been around (for the most part) throughout human history? What kind of environmental catastrophe could possibly contaminate the gene pool to the point where we would need to repopulate the earth with heirloom, non-GMO seeds?

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SOURCE

By Michael Major for Crop Trust - https://www.flickr.com/photos/croptrust/54368366423/, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=161435003