Leaders start with the false assumption that everyone has to get all the energy, comfort, and convenience they want.
The choices are more like:
How do we reduce the human population?
Get them to eat less meat and fish?
Take away their personal motorized vehicles?
Replace our infra-structure without any new concrete or asphalt?
Re-tool sanitation systems to recycle all the mineral elements in our food supply and wean off chemical fertilizer?
Acclimate to sweating in summer and shivering in winter?