I'm generally with the detractors on a lot of this. I don't think that bringing back dinosaurs is the best idea. I do think getting more diversity with grazing animal populations and increasing the numbers for ruminants would be beneficial. A lot of the grasslands have deteriorated as the numbers of grazing populations have declined. Nature is an ecosystem, not a mono crop.

On the flip side, just with breeding, we've seen what variance can do to bee populations (africanized bees), and how a lack of diverse pollinators are less effective than honey bees alone.