An excellent presentation by Daniel Batten which easily understandable (as it is aimed at investors) clears up the “Bitcoin boils the ocean” energy FUD.
Yes, you can see the logos of ETC / Litecoin, but you have to overlook these shitcoin which also use PoW in this context and they are not mentioned.
I can recommend this lecture to every Bitcoiner to strengthen their knowledge and argumentation in this area.