Until they have to change their lifestyle. Then, they'll only do it if there is some reason. Otherwise like like to whine that Someone should Do Something! They'll wring their hands about the evil corporation/rich/whatever that are supposedly responsible, like shit on Facebook that says it is about change, and go back to living how they always have.
Reason is reducing energy use requires compromise in one form or another. You can either choose to stop doing/using some things, or you can invest more money in more efficient equipment (which of course means less to spend on fun stuff, at least in the short term).
Personally I'm a fan of option 2. You put more money in to efficiency and you reduce your energy usage and, in the long term, expenses. However it can cost a lot up front. My AC died a few years ago, cost of repair was way too high so it needed replacement. Well I had the option of getting a replacement for about $4800ish. However that was low efficiency, equivalent to the unit that my place came with. A high efficiency unit was $7000ish. Whole lot more money, I've not made it back, but it was worth it in my opinion.
Turns out you can affect a fairly substantial energy reduction if you work to buy efficient devices. Now that doesn't mean run out and replace everything (there's a lot of energy in building something too) but if when something needs replacement you get a high quality model that is more efficient and has a longer service life, you can do a good bit. You can then do even more with other changes to your life, like biking to work if feasible.
However I find most people don't agree. They go for what's cheapest now, long run be damned. That includes those that care about the environment, climate change, oil, etc. They "care" only to the extent of talking about it and suggesting others should do something. They are disinterested in making changes to their life.