Regardless of which geoengineering scheme people might someday invent or try, some consequences of climate change will likely continue. That's because many geoengineering proposals don't directly address the root cause of global warming.
Our food, energy, and transportation systems pump carbon dioxide and other greenhouse gases into the atmosphere, and will continue to do so unless we eliminate those emissions. Those gases will keep trapping heat from the sun, raising average temperatures on land and in the ocean, and causing the sea to become more acidic.
So even if planes release sulfur into the sky, warming would shoot back up when those flights stopped. Building a wall under ice sheets wouldn't address the other effects of climate change. And covering the sea surface in foam wouldn't end ocean acidification, which is caused by carbon dioxide.
The simplest way to maintain the stable climate that has allowed modern human civilization to thrive is to end our original geoengineering experiment: releasing unprecedented amounts of heat-trapping gas into our planet's atmosphere.