To introduce NEDO’s project in area of the Synthetic fuel and IC engine to achieve carbon neutrality by 2050, it is essential to replace fossil fuels with fuels that do not increase CO₂ levels in the atmosphere when burned. Such fuels have the potential to transform the energy supply and demand structure in Japan—which is dependent on fossil fuels from other countries—making it important from the perspective of energy security. Using existing infrastructure will help reduce initial costs. The goal is to solve issues related to production technology and lower production costs to implement them throughout society. It is necessary to promote the development of technology for carbon recycling fuels as one of the various options for realizing a decarbonized society. Synthetic fuel as a Carbon-neutral fuels is one of approach to realize for a carbon-neutral mobility future, from this viewpoint, NEDO’s fund of Green Innovation Fund is to subsidize R&D activities of Synthetic fuel and IC engine.