If the key impact is declining bee populations, it would seem that the current ecology of almond growing is unsustainable. But that should give growers an acute

If the key impact is declining bee populations, it would seem that the current ecology of almond growing is unsustainable. But that should give growers an acute incentive to invest in bee populations, lest bees shoot up in price and wreck the economics of their orchards. If growers aren’t doing this already, why aren’t they?