Earlier this month, the International Renewable Energy Agency said the world needed to invest $131 trillion by 2050 in order to limit the estimated global rise in average temperatures to 1.5 degrees Celsius. That’s 30 percent more than what is currently planned. It’s also equal to investments of $4.4 trillion every year from now until 2050. How realistic are these spending goals? Well, it appears that the realism of IRENA’s estimates depends on how you look at the energy transition: as simply an increase in renewable energy generating…
