So what if something took a million years to evolve? It doesn't follow that this long timeline ought to create any sense of obligation, moral or otherwise, by itself. We don't owe anything to non-sentient organisms.
Sure, we can call it save the planet and feel important but say if the ecology balance is broken down, food chains are broken up, its humans who get adversely affected, with perhaps lot of other species but there are going to be lots of species that will do just fine, some will perhaps even thrive. In other words, life goes on, without humans, no one cares.
Disclaimer: Few ideas borrowed generously from George Carlin's take on save the planet. Funny but wise, I think.
Lots of people see environmental protection as a terminal value instead, and few things offend people more than proposals to trade off terminal values for instrumental ones.
Which is terrifying if you just knocked out a keystone of your ecosystem.