There's 8 billion people on the planet already and something like 80% live in developing countries. There are massive productivity gains to be had as those people improve their education and move into more productive jobs.
How does productivity translate to sustainability? Historically, as countries became more developed and increased productivity, they also increased resource consumption.
Growth has its limits. It is generally sigmoidal (S curve), not exponential. It’s reasonable to assume we’ll hit the inflection point long before the sun becomes a problem.
My point is that we’ll need to find some kind of equilibrium that doesn’t rely on continual growth, because that won’t be sustainable. After we manage that, there’ll be still enough time to worry about the sun. And if we don’t manage that, we’ll be doomed regardless of the sun. (Barring interstellar travel, in which case we may stop caring about the sun anyway.)
There's 8 billion people on the planet already and something like 80% live in developing countries. There are massive productivity gains to be had as those people improve their education and move into more productive jobs.