Battles are not only fought between humans. There is one which has been raging on since the dawn of man.
The world is not ours, and yet we have been using it to sustain ourselves, grow and proliferate for millennia. Nature has its own ways of keeping us at bay, although we might not realise it.
What we call decay is in reality our earth reclaiming its territory - restoring, healing itself from the scars of human intervention. When humans are gone, there will be no trace of them within a few centuries. Earth will heal and everything will start over again.
What we see as decomposition from our point of view is recomposition from nature's point of view. And it's beautiful.