Depends on what modern TV since most people are buying bigger TV's now. An 28" CRT uses about the same amount of power as a 55" OLED so replacing the former with the latter does not improve energy use.

Besides that, energy is not wasted if it's used to make pretty pictures ;).

Of course but to make an intelligent decision, one needs to be aware of the costs.

A good point. I just checked - the CRT draws about 120W and the 40" LCD about 70W. The latter is more than I expected, given that it's not particularly big by modern standards - though it is a few years old itself by now.

LCD monitors have strong backlights but most of it is lost. You have diffusers, polarizers, color filters, opaque elements between pixels, and this is before the blocking done to construct the final image. I think the overall intensity loss is over 90%.

Residential TV power use is probably not a big factor (unless you have a TV problem), and even though CRTs got nice and warm, modern OLED TVs do just the same. Many even have cooling fans for the panel.

Manufacturing the new TV costs energy. When you buy brand new you’re just paying the energy cost upfront. Depending on the usage this may or may not break even.

Be aware of the energy you are wasting, a modern AI uses much less power than a human.

Now you listen, If I’m going to be replaced by an AI it’s not going to be for some boring economical reason.

It’ll be because I‘ve been deemed surplus to requirements by the algorithm and smooshed down into base nutrients with everyone else, thank you very much.

Older technology like paintings just sitting there in a museum and Greek sculpture used way less power than AI.