The evidence is mounting:Humans were responsible for extinction of large mammals

I would question the "action/consequence" a bit for two reasons. Firstly, the environment we consider natural in the main is post-megadeath for the mega fauna. New Zealand is the place where most recently megafauna (Moa) were hunted to extinction, in all other places including Africa we've mostly been in this world since their ending, to all intents and purposes, for hundreds if not thousands of years.

Secondly, The absolute count of mega fauna at risk of extinction is now quite small. Not a good thing, but we're talking Whales (which we took care of mostly) and Elephants (which we are not taking care of adequatly, mostly) and Rhino (which we've completely failed at). I think Hippo, pablo escobar apart are not at the same risk although I may be wrong. I see they are listed as at-risk. So thats 4 major species, 3 in one continent mainly, one universal in the sea and although virtually hunted to extinction, on the mend. So whats to do? What is the action/consequence here because I think we're beyond the point where not killing elephants is going to alter the biome constructively (which is terribly sad) -Again, if there is a specific role we'd gain from widespread Elephant populations at large, I'd like to know.

Are Giraffe "megafauna" ?

The other risky species are frogs, birds, and carnivores. Few of them feel like megafauna. They are very important however. Diclofenac was a disaster for vultures.

If the actual message is "don't extinct things" then thats ok.

But, if the extinctions happened 10,000 to 1,000 years ago, the "remediation" here is to a state we as modern humans have never experienced. I'm not sure we have social licence to do that.

For the modern era extinctions of megafauna, It's not like re-wilding scotland for Beavers, we'd be putting wooly coats on elephants and putting twenty thousand of them into North America, Canada, And other places north of the Arctic circle. We'd be putting 2 million bison on the march across the central wheat belt of america. I would love to see that get through both houses, and the states. (2 million is low btw. There were up to 60 million of them by google search)