Algae AquaCulture Technologies
Maude and I just watched a film ("The Need To Grow" from the food revolution network in the USA) about this phenomenally impressive power station in Montana, (the company named above) where they use landfill waste, carbon dioxide, waste wood, water and sunshine to produce: electricity to heat homes, biochar and algae to astonishingly-well improve depleted soils, thereby sequestering carbon and improving the quality of our food because the soil quality is paramount to this.
So solving some of the world's biggest problems....?
That is, if it is allowed the chance to become mainstream. Of course these are not only hugely intelligent and humane people behind this project, but brave and determined in the face of big corporations that are all about fossil fuel and agrochemical use.