Thought of the day:
One barrel of oil contains about 5.8 million British thermal units (BTUs) of energy (1700 kilowatt-hours). That is roughly equivalent to the energy output of an adult human working 12.5 years worth of 40 hour weeks.
At present, the world uses about 31 billion barrels of oil a year. That is equivalent to the global population (6.7 billion people) working for 58 years.
While the theoretical capacity of renewables is even higher, it is a fair bet that they will take a lot more effort to harness. There aren’t many places where solar panels will spurt out of holes you make in the ground.