First off, we are not at existential risk from climate change. Most reasonable estimates suggest on the order of single-digit percent productivity losses for society over the next several decades. Substantial and unfortunate, but not existence-threatening, and in fact not even enough to outweigh reasonably expectable productivity gains from technological development. There are much more serious existential risks to humanity than climate change.
Second off, no one has enough information about the global state of the world that "just think about the big picture" is actually good, actionable advice. People only have enough information and processing power to do local maximization, and this actually works exceptionally well. If you want whatever arbitrary "big picture" stuff you're into to factor into people's decision-making process, the best way to do that is things like tax incentives. How well this works is up for debate, but it's certainly better than vague appeals to "save the environment".
I'm not sure what you're calling the "death economy". Could you explain that further?