Solar power sits within Energy, the sector that powers every other endeavor on this list — a category with an adjacent, sourced scale metric: World Bank: developing countries' electricity investment need rises from $280B to $630B/year by 2035 — an investment-need figure, not total global energy trade (World Bank). Solar power is sourced to EIA's Energy Explained topic taxonomy and analysis studies, the same institutional basis behind all 17 of the category's items, rather than an editorial judgment call.
In this category
Solar power is 1 of 17 items in Energy. See the full ranked list, or browse all 20 Human Endeavors categories.