How do you knows the Keystone is ponzi? The others are money laundering not poinzi.
Increasingly we are spending a higher percentage of the energy we get in the extraction of that energy. That’s not sustainable in the long run and it’s certainly not a good economic strategy.
The only way the ‘tar sands’ extraction can make money right now is by suckering in investors who think there is going to be a big payday down the road. But most of the money being made is in luring in investors.