Yep.
But there are not enough caves to go around, and the sanitary facillities are limited. Which is why we started building our own caves...out of wood, brick, etc.
It is unfortunate these folks haven't figured that out yet and are intent on reinventing the wheel--or not.
It means for every rural third-worlder who does not use electricity, and is kept incapable of accessing electricity, emissions "traders" can sell permissions for other companies to make electricity.
Of course, part two of the equation is that India and China are exempt from limiting their energy production.
Conclusion: Do we want to live in a brown-out world in our own country, plus, at the same time prevent poor people around the globe from improving their lives in any way. How does that equal 'fairness' and 'compassion.'