I think that after the consequences of climate change have finally been realized only a few short decades from now, many people will come out of the woodwork to say that they really did believe it was hopeless the whole time, but that declaring it was hopeless before the consequences happened would have been labeled counterproductive for the people that did not believe so. It would have been declared as giving up hope too soon. Irrationality in the face of obstacles that are actually impossible to overcome stems from the same mechanism which has caused those same people to accomplish goals that are reasonable, like getting better at drawing or running a marathon. There's no sense in denying one if it's inseparable from the other.
My opinion is that there is no solution. It's frequently said in the context of relationships that you can't change everyone. Forcing everyone to align with your worldview is the only real hope we have to prevent the continued destruction of the environment, and yet in the context of human friendships it's considered misanthropic. People still want their power, and their identity, and their freedom, and we are collectively powerless against that instinct.
I do not think we're ignoring the problems on purpose. We're just so bad at taking into consideration the consequences that might not take place in our lifetimes. It's a limitation of our human imaginations.
Our innovations in technology have raised our expectations, and with those expectations comes a baseline of additional carbon emissions. We're not going to go back to the industrial revolution for the planet's sake.
I choose not to put my limited time and energy into worrying about a lost cause, and will have to try to continue to do the things I want to. That battle in itself is already all-consuming for me.