What the Numbers Mean

With the defaults (meat daily, medium house shared by 2, 10 h/wk driving, 4 h/yr flying, average shopping), the footprint is 6.95 gha — about 4.3 Earths. Food (2.5 gha) and goods (2.5 gha) dominate, followed by transport (1.2) and housing (0.75).

The 1.6 gha Budget

Earth's biocapacity works out to roughly 1.6 gha per person. Every gha over that is overshoot — funded by depleting natural capital. The biggest levers are diet (drop 1.3-1.7 gha), shopping habits (up to 2.5 gha), and driving (0.1 gha per hour/week).