It's true. We can't.
We humans do not possess the technology to destroy this planet.
We can only destroy everything we like about it.
We humans think we're soooo special, we've got horseless carriages and nuclear bombs, and we rape our planet of it's natural resources while it slumbers under the influence of the two ruffies we slipped in it's drink. It will never recover.
Why don't we call a spade a spade? The planet earth has been around for a LONG time. Humans…. notsomuch. So stop saying that we're killing the planet! We're NOT. If we irradiated every tree and flower on this rock tomorrow the planet would still be just fine. Give it another million years and the same block parties that were going on before would be annoying the neighbors again. We're a blip. Another species of the millions that have, will, or do inhabit earth.
Humans do not exist outside the natural order of things. To think so is arrogant. We're another species making our way just like all the others. We live at the mercy of our environment like every other species, and when the planet does decide to smack us around many will perish, and maybe the strong and cunning might survive.
Instead we should look at the planet like we do our homes: You can let things get run-down and trashy, or you can keep things tidy, maybe even renovate the bathroom. And when you move out or die, maybe your kids will move in after a long and bitter will contention, or maybe your assetts will be siezed by the state to pay for your outstanding parking violations. Ultimately we will parish, and maybe our nice things will go too, but the real-estate we thought our very own forever will still be there to become someone else's.
So don't save the planet. Save yourselves. Maybe when you die you can look back on your life and know you contributed in your own small way to the cosmos… or maybe you just left a messy house and some unpaid debts.