New Delhi [India], February 23 (ANI/NewsVoir): Absence of new instruments to facilitate long-term lending and bottlenecks to free trade are the key challenges in bringing down the cost of green hydrogen, enabling its production in size and scale and, thereby aiding the decarbonization of hard-to-abate sectors said Amitabh Kant, G20 Sherpa at the 22nd edition of the World Sustainable Development Summit (WSDS) in New Delhi on Wednesday.