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Most people think of solar and wind as new energy sources. In fact, they are two of our oldest.
As an old-time New Yorker, it's not that I miss the '70s and '80s or whatever. I miss the fact that there was a certain kind of energy that exists when people can live for nothing.
You have to be able to generate usable energy without greenhouse gas emissions, and you have to be able to do it cheaply if you want people to choose that approach. That means new technologies.
When coal came into the picture, it took about 50 or 60 years to displace timber. Then, crude oil was found, and it took 60, 70 years, and then natural gas. So it takes 100 years or more for some new breakthrough in energy to become the dominant source. Most people have difficulty coming to grips with the sheer enormity of energy consumption.