A British research group has urged Japan to reconsider promoting carbon capture and storage and a so-called integrated gasification combined cycle, as such technologies are not only costly but do not significantly cut the country's carbon dioxide emissions.

In a report released this month, London-based climate data provider TransitionZero said Japan instead should focus more on offshore wind power it said could "unlock tremendous renewable energy potential" in the fight against global warming.

Referring to the IGCC, which applies high pressure on coal to turn it into gas, and co-firing coal with ammonia, the group said Japan's "advanced coal technologies" are "expensive with limited potential" and will not help achieve the government's goal of carbon neutrality by 2050.