Add a Comment
Save my information
One important aspect this study failed to examine, never mind underline is that domesticated species like cited cattle and poultry have almost 1:1 filled identical niches previously populated by wild equivalents. From my own study I am aware that for example total bio-mass of cattle in American continent (defined simply as number x weight) closely matches bio-mass of wild buffalo herds in the times prior to the colonization of the Continent. Just bio-mass of now extinct Passenger Pigeon species in America again matches closely with the bio-mass of human raised poultry… So, while humans have indeed decimated or pushed to extinction certain species and narrowed breadth of the biosphere we so far haven’t shifted natural proportions of dominant species types. So, this shift can’t be blamed for increased CO2 emissions. Whatever cattle produces now-wild buffalo did equivalent in the past… So, we must not focus on CO2 regarding this shift but on the real problem-narrowing of the ecosystem breadth/variety/…
Second issue emerges from “Half of life on earth has vanished since we arrived on the scene”, treated in vacuum of the assumption that somehow “normal” Earth ecosystem is the one with human species absent… Same as linguistic trend of calling “pristine Nature” a segment of Nature without normal human presence&impact. In order to properly understand Earth ecosystem we must stop seeing humans as aliens on Earth or somehow supernatural or appointed “management species”. We are part of the Nature. Our impact on Earth ecosystem is… Natural. Our advances and subsequent extinction of the species is Darwinian evolution in progress. We can’t assign “good” or “bad” to it. We can’t grab title of “Earth Ecosystem Managers”. We are one of the species playing Darwinian game of fight for resources with survival of the fittest. It is Natural that fittest survive. Skewing that aspect of life can’t do anything but harm the life. Yes, we are more capable and species that can’t compete or aren’t useful to us fail. But, in exchange we lead quick evolution of species that are useful to us, they take the available Natural niches. Also, there are species that have adapted, as Darwinian rules dictate, to our presence&impact and are thriving. We might not like them (rats, cockroaches,…) but they are normal Nature as well, they are the leading Natural answer to our domination. Nature is never still. Insisting on some fixed biosphere without extinctions and impacts is simply non-scientific. “But we led to the changes”-absolutely normal state of Natural affairs… That is the true science of it.