As I mentioned in my writing, for one thing, we just haven't gone far enough yet. Just like transitions with other things, it requires time. One thing to note, though, about what you're bringing up is that every country and geography is different and will have different types of resources available to it.
For example, you mentioned that district energy is reliant on natural gas. Well, actually, one of the things I teach my students, and that I put into my briefing note, is that two-thirds of the energy across any country, across all sectors of the economy, is typically lost as waste heat. A lot of that waste heat is actually lost in cities.
For example, we don't need natural gas to have district energy. We can basically map out waste heat centres and implement waste heat capture, which could be used for both heating and cooling. That would dramatically reduce the amount of fuel we need for heating and cooling—for example, taking waste heat from industrial processes and using that for district energy.