This is an emotional response and not a scientific one. The Haber–Bosch process was the biological equivalent of a deferred-interest loan. It gave us enough food to scale from 2 billion to 8, but now the planet is coming to collect its dues. We never had the natural resources to support humanity's current numbers, and by inflating our Nitrogen supply and stripping the Earth of everything else we need, we've utterly fucked it all up. Degrowth would be the worst tragedy in human history, but it would at least give future generations a chance. Geo-engineering is like paying off one credit card with another. It's a recipe for further disaster and doesn't solve the underlying issue. Humanity has to default.

Geo engineering is jumping from a cliff and hoping there is water down so you don't hit concrete.

Degrowth is the only sustainable solution, geo-engineering will create more problems than it solves.

It is the only practical solution. The only way to get humanity's energy equation to balance is to dramatically reduce the population or dramatically reduce energy use per capita or invent and deploy a mythical free energy source within the next 30 years. And this just covers replacing black energy with green energy -- even more energy will be needed to address the climate problem.

Degrowth not only is a solution, it's a guaranteed outcome if other initiatives don't materialize to successfully address the problem.