Even in darker moods, most people are still worrying about things far more trivial than the 24/7 destruction of their only means of life. Denial is the default programming.
If people were seriously planning to stop the destruction of nature it would be echoed in the things they do and say on a daily basis, but most social chatter is about making money (from depletion) feeling good and staying entertained. Watch and listen to your neighbors and co-workers. Most are ego-driven and the rare ones who dwell on the common good are seen as less than “successful” by bling standards. There’s little evidence that enough people care about the true source of life to protect it from money-hungry urban banality. Let’s stop pretending the planet can be saved from us, by us. Benevolent aliens won’t do it either.