A meaningless distinction. Assuming for the sake of argument that there are actions we can take that would solve our predicament, we are unable to persuade the people, governments, and various powers that be to take these actions. That is inability.
To suggest that is not inability reminds me of the joke where the mathematician sees his room on fire, and sees the fire extinguisher, and declares the solution obvious and goes back to sleep. Politics is real.
I'm really curious - if it's not humanity, who forced us to do this? Who's forcing people to travel and over-consume? The capitalist hellscape sure facilitates and accelerates it, but it doesn't force people to over-consume, travel tens of thousands of miles a year, etc.. Most of the people who don't do these things only refrain because the system isn't allowing them the wealth to afford it.
The number of people who actually live sustainable lifestyles through choice is utterly miniscule. Most of us have the option of accepting the radical extreme poverty that would be required to sustain 8 billion people on earth, but just about none of us take it.