Given much of the transition to renewable energy is planned to be solar this may be counterproductive. China is rolling out monumental amounts of solar at the moment, we can't just block the sun since it's part of the solution.
Re-engineering our space program towards space manufacturing, mineral extraction, and building permanent residences in space sufficient enough to support the people that would be needed to build and maintain space-based infrastructure like a reflector would be an undertaking I'm not sure humanity currently has the drive for.
Science and futurism YouTuber Isaac Arthur is going to love this. Giant aluminum reflectors are a huge part of future space infrastructure and he is happy to point this out quite often.
The industrial revolution was a mistake. Convenience and comfort have proven to not be worth the cost of complete ecological destruction. Total deindustrialization is the only solution, and it will not happen. We're going to kill ourselves off, or nearly, and the world will be a better place for it in the long run.
The UN Environmental Program's recent report into SRM concludes that it is not currently a realistic or wise plan.
"UNEP concurs with the panel that, at present, large-scale, or operational deployment of SRM technologies is not necessary, viable, prudent or sufficiently safe, given the limited scientific understanding and uncertainty about the potential impacts and unintended consequences," says UNEP’s Chief Scientist Andrea Hinwood.
"The review concludes that SRM cannot replace reducing greenhouse gas emissions."
Nonetheless, the body doesn't rule out the method altogether, with the report concluding that their assessment of the technique "may change should climate action remain insufficient".