27, the cofounders of French startup Néolithe. Their patented fossilization process turns non-recyclable waste into mineral aggregates for use in the construction industry. The Chalonnes-sur-Loire-based company cofounded has 130 employees and, since its inception five years ago, has raised $23 million.
Another French company working to decrease the global carbon footprint is Dioxcyle, which is building a device called an electrolyzer to convert CO2 into commodities like jet fuel, antifreeze and furniture. Cofounded by Cambridge graduate and Stanford post-doc, 29, the Paris-based enterprise has raised $9 million in funding to date from investors including Bill Gates’ nonprofit organization Breakthrough Energy Fellows.
, 28, founded Integrals Power, which develops high-performance and reliable lithium iron phosphate powder for lithium-ion batteries. The company has raised $4 million in funded projects from the U.K. government, innovation agency Innovate U.K. and more. This year’s list also features companies with a mission to accelerate the world’s transition to sustainable aviation. Founded by Cambridge graduate, 29, Electric Flytrain develops electric and hybrid-electric batteries, power electronics and motors for the aviation industry, and also has its own hybrid-powertrain product for unmanned aircrafts. The Munich-based startup has raised over $2 million.