Net-zero, at what cost?

According to Dr Prodipto Ghosh, Distinguished Fellow, Earth Science and Climate Change Division, TERI, if a policymaker today were to decide on a decarbonization policy till 2070, they would likely discount future costs. But if policymakers at different times were to decide on decarbonization options in their times, they would not discount costs. One cannot meet capex or operation and maintenance costs with discounted rupees or dollars. One must find real money.