When Ant Farm installed "Cadillac Ranch", its infamous/renowned artwork along side a Texas panhandle highway, the members of the group were not lonely art cowboys on the plains expressing concern regarding Americans' addiction to driving.
At the time, activist members of a California group that called itself "Urban Ecology" were roller skating around city streets depositing 'tickets' on cars that exhorted their owners to reflect upon their driving habits. Instead of fines, the 'tickets' listed oil costs and information on fuel production.
In the mid 1970s, Richard Register joined this crusade by growing a vegetable patch in his 1968 baby blue metal flake Pontiac GTO. For three years"The Veggie Car" produced carrots, celery, lettuc, cauliflower, tomatoes, peas, beans, artichokes, corn, melons, squash, sunflowers, irises, poppies, marigolds, and violets. Image of Veggie Car
All three projects employed humor to comment on the serious environmental concern.
Smiling seems less commonly used as a strategy for environmental reform today. Perhaps this is because it has become more difficult to smile in the face of mounting evidence of impending planetary disasters.