The battle lines on geoengineering have begun to take shape. On one side are modern-day romantics, who consider geoengineering an a priori violation of humans’ role as planetary citizens to let nature be natural and take a humble place within it. Better to solve the climate problem by reducing our impact on the planet, they say. Prominent among their antecedents is American forestry ecologist and writer Aldo Leopold, who asserted in A Sand County Almanac in 1949 that environmental problems demanded that man change his role from “conqueror of the land community to plain member and citizen of it.”