That is the idea behind some carbon offsetting strategies that involve reforesting efforts incentivized by lower emissions taxes. Some programs are more success

That is the idea behind some carbon offsetting strategies that involve reforesting efforts incentivized by lower emissions taxes. Some programs are more successful than others, but the government's are deincentivized to provide these breaks because they are often the smaller nations who actually need the revenues. The sea algae idea strikes me as a cure that is potentially worse than the disease. I could just see use causing the 6th great extinction by (either intentionally or accidentially) introducing a genetically modified algea into the open ocean which over oxygenates the atmosphere, swinging the planet into an ice age. Build more nuclear reactors, try the thorium reactor to reduce the waste, and invest in solar power for the long run. Hell, if the Serbian physicists who uncovered Tesla's notes on the world power distribution tower managed to get it working, we can sacrifice a desert or two to build solar farms large enough to power the world.