I agree that humans are remarkably creative, and I agree "don't have kids" is reasonable. But the "end of humanity" might come through this. However, I agree that we might be able to survive this. But please take it seriously. The whole climate crisis is a complex challenge by itself, and the politicization of it, along with the capitalistic interests, are complicating it further. We need urgent global action if we want humanity to survive.
Consider: Not all those billions of people will survive the sudden shift in climate. The breaking points in climate make everything super difficult to plan for. It is not just about finding higher ground that is climatic for humans, the whole agriculture will be a big problem. The climate will be so different from what we have right now, we are not perfectly sure how which crops would work where. We need globally aligned tests, knowledge sharing at the very best, along with all the action we need to take along with carbon emissions.
This challenge, is our biggest yet. We need a global, aligned, focused effort. But, we are far from it. The stress is causing conflict everywhere. Our international order is not up to coordinate this global effort, unfortunately. And if COVID-19 showed us what we can have on a global scale as a response, it means every nation state will turn inwards, try to fight against it by themselves while also fighting against everyone else. This problem is the crux. Our systems, our worldviews, our doctrine are not up for this fight ahead.
There is hope. But there is also a lot to despair about.
Because they were "leaving money on the table" instead of getting it for their shareholders.