Petroleum...it has lots of relevant and interesting information...btw, BP estimates that there are 47 years left of oil reserves at current consumption rates...oh, and it takes anywhere from 60-250 million years to replenish them...just saying...
Then, there's the Climate Change problem...for another thread.
Link: https://www.bp.com/en/global/corporate/energy-economics/statistical-review-of-world-energy/oil.html