Carbon fuels are essential for the production of reliable cheap electricity. Green energy sources are niche providers at best. Without reliable cheap electricity there is miserable poverty, political instability, famine and suppression. A cutback of as little as 10% of carbon usage would be disastrous for the poor. Sadly this Pope is a socialist and simply does not understand productive capitalism. He really is authoritative from a Catholic perspective on theological issues.
How can he be? He is a socialist which is anathema to Christianity.