I'm currently reading the book and this is a concept of a show I'd love to see.
Based on the book. The premise would involve seven portals appearing across the world in national parks leading to a parallel earth where humans and their extinct relatives never existed, a earth that is nothing but vast wilderness with extinct animals that still exists.
Africa: Serengeti National Park, Tanzania
Asia: Chitwan National Park, Nepal
Australia: Uluru-Kata Tjuta National Park
Europe: Bavarian Forest National Park, Germany
New Zealand: Mount Aspiring National Park
North America: Yellowstone National Park
South America: Torres del Paine National Park, Chile
And from here how the world would react to this. Countries obviously fighting over the rights who gets to claim them especially the ones where the portals had opened, basically colonization from countries and governments with animal biologists and paleontologists joining them to research and study said extinct animals whether mammoths, saber-toothed cats, ground sloths, short-faced bears, moas, haast's eagles, thylacoleos, megalanias, tasmanian tigers, dodos, etc. and protestors notably environmentalists protesting on the idea of colonizing this world thinking it should be left in peace.
Worldbuilding such as extinct animals being brought back to our world to rewild and to zoos, helping endangered animals given healthy populations of that world by bringing them back to rewild and of course throughout the colonization of this world, new countries gains independence on this parallel earth and countries of our earth talks what lands they can claim.
What do you all think of this idea?