Ecological Footprints Practice Test

Insulating the attic, because it reduces heating fuel use and therefore lowers the carbon component without increasing other components.

Switching from beef to beans, because it reduces land needed for feed and pasture and typically lowers greenhouse gas emissions per calorie.

Taking more long-distance flights, because aviation fuel use adds substantial CO$_2$ emissions and associated land-equivalent sequestration demand.

Using fewer disposable products, because reduced materials consumption generally lowers upstream energy use and land demand across categories.