A few years ago I started writing regularly about electric cars and the batteries that power them—technologies that are helping humanity transition away from reliance on fossil fuels. And as bad news continued to pile up about the harms caused by climate change, I started to think harder about my own carbon footprint.
So last year, my wife and I got solar panels for our roof. Then we replaced our air conditioner, getting a model with a heat pump capability. Shortly after that, our boiler sprang a leak and we got a new