If you want to wind up a building scientist, you might mention the topic of insulation. Better yet, mention the advent of expanded cork insulation in the United States from Portugal-based Amorim Isolamentos. The insulation is made from leftover material from cork bottle stopper production which is heated and sliced into boards, according to Alex Wilson of BuildingGreen. Thus, the insulation is rapidly renewable and entirely natural.
It’s surprising how easy it is these days to line up all the components necessary for a residential-scale photovoltaic array. Solar panels can be purchased on Amazon (among other places) and tracking systems are readily available, too. If you have the land or your roof isn’t right for your needs, Arizona-based Schletter makes a ground-mount kit for up to 2.5 kW of solar PV and it can be purchased for under $1,000.