In the general case, absolutely. Thousands of humans working for thousands of years can do impressive things. I don't have any particular knowledge of the grass

In the general case, absolutely. Thousands of humans working for thousands of years can do impressive things. I don't have any particular knowledge of the grasslands of tropical africa and a quick look at the literature shows a pretty ambiguous situation that I'm not qualified to speak to, but the concept as a whole is one that I find reasonably plausible.