I care about the environment. $25 million L are being given away to a person who can design a system to remove 1 billion tons of CO2 from the atmosphere per year.
I would like this system to be a self-perpetuating chain reaction, but that could be dangerous as plants require CO2 to breathe, and we need them. I also expect this system to be fantastically large or widespread since 1 billion tons annually is quite a lot.
I also believe that there is no way to do this that will make fossil fuels sustainable or a positive choice. Hydrogen fuel is the way generated from frequency-split water, and electrical energy from the universal constant, or earth's ionosphere, or conflicting magnetic fields is the other half. See Nikola Tesla, Dr. Moray, William Reich, Stanley Meyer.
To begin: we take a special cement coating made by an Italian company that breaks down CO2 and nitrogenous exhaust gasses in the presence of light. We don't need a lot of cement to make this coating. Just a thin layer. We may also be able to attach this coating to a non-cement surface, but until then cement will do.
We need to eliminate CO2 from the places where it is made, namely car and truck exhausts, power plant and industrial stacks, and apparently the soil is releasing more CO2 than it used to. Making these upgrades to mufflers and exhaust pipes and chimneys will 'silently' remove 1 billion tons of CO2 per year from the atmosphere.
In addition to this a series of centralized units in problem spots shaped like heat syncs with arrow-slit slanted openings and LED or capacitor-controlled fluorescence can activate a coating on the cement at dusk and night to break down harmful gasses.
It may also be beneficial to place ionic panels outside urban skyscrapers in their wind tunnels to cling nasty bits off of them. A motorized wiper could run up and down them to collect the musk whenever the weight of the funk on them becomes great. We can power these ionic panels, and substantial portions of the building, using windmills constantly in the breeze of the skyscraper's wind tunnel.