their best hope
I don't understand what the underlined part below means.
Thank you always. :)
To destroy a whale is a monumental denial of life and merely one symbol of the human species’ rather recent hatred for the world.
We have named one whale “killer.” But that shoe best fits the species who possesses feet to wear it.
Whales are more appreciated than ever, and whale watching yields more lucre than killing does.
In that appeal to our self-centeredness lies their best hope.
But even if all of us gain the emotional and intellectual maturity to finally divest ourselves from harming them, we may yet lose them in an ocean of plastics, chemicals, fishing tangles, spinning propellers, speeding hulls, and noise. All whales now have trouble competing with the aquatic primate for the fishes of the seas. The more humans fill the world, the more we empty it.