The most important take away I think is that computing uses a helluva lot of more energy compared to what people think it does. Loading Facebook on your phone and seeing a newsfeed uses a fair bit more power than just the fraction of a percent of your battery's storage. Multiply that by 1.3 billion users and by a few thousand request per user per month - I suspect that's a lot of energy.

I think a lot of climate change action includes to a degree a reduction in energy usage - but I don't see that happening any time soon. Unless computers get dramatically more efficient in their energy usage, energy demand will continue to grow. Renewable energy source growth will have to beat it.