Are you aware that less than 6% of US farmland is irrigated, and only half of irrigated farmland (3% of total) uses groundwater?

97% of our farmland uses no groundwater. None.

If US lost 3% of its agricultural output tomorrow, we'd still be growing more food than we can possibly eat; still be filling our cars with a mix of gasoline and corn liquor as we do today.

Perhaps I should have asked this question instead: Is there any evidence that would cause you to change your belief that society is on the brink of collapse, or is that belief unfalsifiable like religious faith?