This tiny aircraft has been converted to being powered by electric motors. Whilst the technology behind this is remarkable it is hardly accurate to describe it as 0% CO2 as the batteries do need to be charged. The Spitfire in the background is a replica

One of two electric powered Cri-Cri that were present at the 2011 Salon. This one states that it is zero CO2 emission which is rather a fallacy - it does not generate CO2 when flying but it will use energy (and thus generate CO2) when being charged. Nonetheless, the technology is remarkable

A normal Cri-Cri is acknowledged as the worlds smallest twin engined aircraft though this example has four engines in this unique combination. The aircraft is built with composite materials and is powered by four brushless electric motors. It is very quiet and aerobatic, an amazing sight with an endurance of about 30 mins for cruise or 15 mins of aerobatics