@Nouveau_Burnswick @hazeebabee
I remember a manual for rooftop gardens from Montreal back in the 1970s.
There are lighter growing media than soil and, of course, hydroponics and aeroponics.
Years of links to urban and advanced agriculture developments at http://cityag.blogspot.com
Years of links to net zero energy building developments at http://zeronetenrg.blogspot.com
Both are also free listservs
@ME5SENGER_24 @gandalf_der_12te
Last I heard, the estimate of upkeep on solar was about 5% of the cost of fuel for the same amount of power but that was a couple of years ago. Then again, again years ago, I saw a BU prospective business which was automating solar panel cleaning and have seen self-cleaning surfaces for solar panels ideas since.