Because it's much easier to deny something that big than to take care of it. We'd need a economic/cultural revolution at a global scale. Everything has to scale down, no more ICE, not more plastic, no more food imported from the other side of the world, reduce meat consumption, reduce traveling &c.
The current system is based on unlimited and exponential growth, everything else is considered a failure. An unlimited growth in a finite environment isn't possible, it's called instability.
The second problem is that many people convince themselves that "Science" will save us, that we'll terraform Mars or that shifting to electric cars will be enough, but that's too little, too late. Even if we'd hit our ecological goals, and we're not, we'd be far from fixing the problem. We don't need to slow down, we need a complete paradigm shift. It's like when you move form a basic 40sq meter flat to a fancy 250sq meter house, going back is very hard.
The current system is based on unlimited and exponential growth, everything else is considered a failure. An unlimited growth in a finite environment isn't possible, it's called instability.
The second problem is that many people convince themselves that "Science" will save us, that we'll terraform Mars or that shifting to electric cars will be enough, but that's too little, too late. Even if we'd hit our ecological goals, and we're not, we'd be far from fixing the problem. We don't need to slow down, we need a complete paradigm shift. It's like when you move form a basic 40sq meter flat to a fancy 250sq meter house, going back is very hard.