Hussar said:With the sheer number of huge carnivores, it's a wonder DnD worlds aren't all like Darksun - barren wastelands.
Isn't it the other way about? Herbivores (such as rabbits and goats) destroy vegetation and produce barren wastelands. Carnivores suppress herbivore population, and thus promote vegetation.
The only exception I can think of off-hand is the destruction of the megafauna in Australia, where the disappearance of the browsing herbivores c. 56,000 year ago allowed the plants to accumulate larger fuel loads (10-20 tonnes per hectare instead of 1-2 tonnes per hectare). The result was hot forest fires instead of (comparatively) cool grass fires, and these exterminated the non-fire-tolerant plant species, leading to desertification. But it doesn't happen that way unless the climate is unusually dry.