1981–2021
Lower 48 states. Bars show each year's raw acres burned inside roadless. Both lines are 5-year trailing averages (current year + prior 4), plotted on the same axis since inside-roadless acreage is a subset of the total.
Acres burned inside roadless areas as a % of that year's total acres burned
1981–2021
Gray bars = raw annual share. Bold blue line = 5-year trailing average. Same x-axis as the chart above.
Difference-in-differences regression (Inside × Post, controlling for the overall time trend): p = 0.114 — not statistically significant at the conventional 0.05 threshold.