Conservation action has prevented at least 28 extinctions since 1993

I think the number is much bigger.

In a hypothetical situation that conservation stopped to work: no national parks, no reserves, no protection, no hunting regulations, no zoos - 100s of species would cease to exist.

Hoofed animals would be extinct, possibly except few in the middle of Russian taiga, Congo Basin, Amazonia and Sahara. Mind you, all wild ungulates already in the 1800s were at the brink of extinction in most areas of Europe and North America, starting first protection laws. Naturalists at the time widely believed bigger native animals would be extinct long before 2000. In Asia species like rhinoceros went the same way in the 1900s.
 
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