I agree with you in some ways, but I think there's a communication barrier here. In short, yes, we need to be united in our approach and we need to focus our efforts in the areas that matter most, but individual action is not a united front; it's the opposite.

We've solved other problems through collective action. The climate accords resulted in the Montreal Protocol, which resulted in bans on freely releasing ozone-depleting chemicals like CFCs. This ban resulted in a resounding success--the hole in the ozone over Antarctica, which had been growing rapidly and threatened to leave us with much less protection from solar radiation, has now basically recovered to pre-industrial levels.

We need government action, and we as a people need to hold our governments accountable to these demands. That means demanding that corporations must implement effective strategies to reduce emissions and resource usage in general. It also means individuals must be pressured towards these changes, but that can only work if it's economically feasible for the average person. I'm in my mid-20s working full time and I can't even afford housing for myself, nor could I find a modest, truly eco-friendly home if I wanted to. How am I supposed to dedicate the energy to find more eco-friendly options when they're sparse, poorly supported or actively resisted by the structure of society, and most of my energy is already taken up just fighting to survive at all?