Grid & transmission infrastructure 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). Grid & transmission infrastructure 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.
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Grid & transmission infrastructure is 1 of 17 items in Energy. See the full ranked list, or browse all 20 Human Endeavors categories.