Significant difference is that nuclear weapons are not deniable, bioweapons are.
The United States (and allies) have already used rain seeding, river damns, and a number of other techniques for damaging adversary nation's economic and agricultural abilities. It's even a relatively common practice in geopolitics (India uses the Indus river as a carrot/stick against Pakistan).
The United States (and allies) have already used rain seeding, river damns, and a number of other techniques for damaging adversary nation's economic and agricultural abilities. It's even a relatively common practice in geopolitics (India uses the Indus river as a carrot/stick against Pakistan).