Driving an electric car that gives off no emissions is one of the best ways to reduce your personal transport carbon footprint. But if an EV is out of reach, the next best thing could be a simple retrofittable, scalable device called Air2Nitrous (A2N). Its creators claim it can reduce engine emissions by 90 percent, while cutting fuel consumption by 20 percent.

The Air2Nitrous team describes its electronic emissions control system as a "first phase" device because it works before and during combustion. It cuts emissions by increasing the amount of oxygen molecules and decreasing the amount of nitrogen molecules in the combustion chamber.

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