Mankind's ideas of energy production must be re-thought in order to survive... The relyance on fossil fuels or nuclar energy does not help. All sources of energy should be thought about, so tidal energy is OK, but not very efficient. It has be shown to work (e.g. in the Netherlands and France in estuaries of rivers)... Wind energy is efficient in costal areas but has been depending on state funding... But do you honestly think that coal mining or the production of nuclear energy/Waste is not depending from state funding/subsidies?
An introduction can be seen by the Open University, see URL:
https://www.open.edu/openlearn/ocw/mod/oucontent/view.php?id=73747
Do you have helpful ideas or thougths?