If

In the 1940's there were only 40 Siberian Tigers left in the wild.

With a hunting ban put in place and help from conservation societies, within 60 years the population has risen to 600.

If we put our minds to it we could still have orangutans in 20 years time, we could save the mountain gorrillas from the mists, we could stop global warming so that polar bears and penguins had lovely freezing places to be.

If we really wanted to, we could.