We're not going to "save the planet". The planet is far more resilient than we bipedal meatbags.Depends on what you mean by “hope”.
The genome indicates that H0m0 sapiens has survived several severe population bottlenecks and it seems increasingly likely that we’re approaching another, probably of our own doing. My best guess is that it will be either nuclear or viral in origin (made in China again of course).
If history is any indication, a few of us will survive. So sure…hope.
Edit: To whit, I had to type our species’ genus with zeros instead of “o” because, no, there is no hope for humanity after all.
Saving the Earth is hubris and our attempt to save our own species. Maybe the planet would be better without us.