Why the Long face?

I've been privileged to see Giraffes (fairly) up close, though in captivity rather than in the wild.
They really are beautiful creatures and it would be a huge loss should they become extinct.
It was worrying to learn that their number has plunged by more than 50,000 in 30 years and largely due to us Humans..again.
https://d1o50x50snmhul.cloudfront.net/wp-content/uploads/2015/09/abw267-1200x800.jpg
(image source: https://www.newscientist.com/article/2058123-giraffes-spend-their-evenings-humming-to-each-other/)

How many animals need to become extinct before humanity learns to take action to prevent these disasters from reoccurring?