Thats simply not true. Engineering 'solutions' to climate change like more efficient or cleaner technologies, or things like direct air capture are also social signaling, although more veiled and perhaps self delusional. These solutions are the equivalent of building more lanes on a highway instead of going with public transportation solutions. If anything many of these technologies may end up making climate change demonstrably worse through increased consumption.

The only real solution to climate change is to decrease the rate of consumption and the overall size of the human population. 'Technical' solutions to climate change aren't. They'll simply increase our bandwidth for pollution.

The answers to climate change aren't technical, they're social. Society needs to become comfortable with the idea that doing less, being less productive and less consumptive, are fine. UBI, socialized healthcare, a guarantee of a basic social safety net so people can be very unproductive and still live safe, reasonably comfortable lives is what we need to solve climate change.