With evidence mounting that we seem to have changed carbon dioxide levels on the planet for the worse, is there anything we can do to fix the situation? James Lovelock of Oxford University (and father of the Gaia model of the Earth) and Chris Rapley of the Science Museum in London have suggested a radical approach to planetary medicine.
They suggest putting pipes, some 100–200 m in length and 10 m in diameter, with one-way flap valves onto the ocean floor. These would use wave power to pump nutrient-rich deep water to the surface, boosting the growth of algae, which would then reduce carbon dioxide levels and also produce dimethyl sulphide. This substance contributes to the nucleation that produces clouds, which reflect sunlight. The net effect should be a cooler planet. Of course there would be other impacts of such a plan, but perhaps it makes sense to, as Lovelock and Rapley put it, "help the planet heal itself".