1. The damage was understood, fairly easily measured, and could be done repeatably. 2. The cause was widely agreed upon. 3. Solutions weren't predicated on

1. The damage was understood, fairly easily measured, and could be done repeatably. 2. The cause was widely agreed upon. 3. Solutions weren't predicated on massive societal change. 4. Compliance was fairly easy to track and enforce. Climate change is lacking all of these to various degrees.