Green molecules—sustainably produced chemicals, fuels, and materials—are at the forefront of the transition to a low-carbon economy. These innovations replace fossil-based compounds with carbon-neutral, or even carbon-negative alternatives, driving sustainability in industries ranging from energy to manufacturing and consumer goods. This mapping showcases 150+ leading startups engineering Green molecules, which comprises here energy carriers/synthetic fuels with a low-to-zero CO₂ footprint. They include green hydrogen (produced via electrolysis using renewables), green ammonia (made from green hydrogen and nitrogen), and synthetic hydrocarbons (made from biological CO₂ sources or CO₂ from the air, combined with green hydrogen).