Alex Tabarrok claims that it would be "easy to do billions of dollars worth of damage to crops and animals with little risk of being caught":
Single bottles of wine from La Romanée-Conti, the legendary vineyard of Burgundy, sell for upwards of $10,000. In 2010 the owner received a threat, the vineyard would be poisoned unless the owner paid one million euro. When the owner didn’t pay a map was delivered that identified several vines that had already been poisoned by drill and syringe. The French don’t want to talk about this and for good reason, agricultural extortion is very easy and they fear copycats.
Megan McArdle wonders why such terrorism is rare:
In the case of terrorists, I think it's that they are not merely interested in body count; they're interested in high profile symbolic attacks. Terror attacks aren't only aimed at us. They're also aimed at the rich people who fund terror groups, and the young idiots terrorists want to recruit. So while my Dad often points out that we're lucky the terrorists didn't think of collapsing a building on Grand Central Station or Penn Station–which would have choked off the flow of workers around the city for years, possibly decades–the fact is, they probably didn't want to go to their backers and say "76.4% of commutes in New York have now doubled!!!" They wanted to take down the (one time) tallest buildings in the world, which they took as a symbol of our unbearable pride and arrogance.
The Dish 