The end of global warming and food shortage already exists here on Earth.
Photosynthesis.
Plants do this All day long. Sure, we could plant more, but why can’t we repeat this in a laboratory? Photosynthesis uses sunlight and water to trap carbon and create oxygen and food. If this could be reproduced, we could improve it.
We have the ability to create microscopic circuits with microchip tech. Processes such as chemical vapor deposition on a substrate are already old tech. Compounds are being applied microscopically in a 3d printer type operation. Shouldn’t we be able to create a vascular system to do the same as photosynthesis?