There is an obvious false premise in that statement.
I presume they meant "fossil fuel" based economy. But the use of fossil fuels has been an enormous benefit to the "poor". Most of them would not be alive if we had not used fossil fuels.
Fossil fuels mean cheap food and housing for the "poor".
The whole "climate change" alarmism is based on degrading everyone's life choices, especially the "poor".
I put "poor" in quotes, because California's "poor" would be considered upper middle class in much of the world. They have free education, free health care, electricity, central heating, air conditioning, usually a car, and food so cheap they become overweight.
What sophistry this call to action is. All based on false premises. Satan is the father of lies.
I don’t think any of these crusaders grasp this. Or care.