The global push for clean hydrogen is being held back by rising costs and “lagging” policy support from governments, a report has found. Announcements of low-emission hydrogen projects are rapidly expanding but developers are waiting for government support before investing in them, according to the International Energy Agency (IEA). The report found hydrogen made through processes that are clean or less polluting account for less than 1% of the gas’s total production and use. The IEA executive director, Fatih Birol, said the world had seen “incredible momentum” behind low-emission hydrogen projects in recent years “but a challenging economic environment will…