I would go for (4).
The trials aimed at eliminating the excuse of.."doing my duty as ordered by my superiors" in matters of war crimes in particular against humanity (genocide, extermination, violence and retaliation against civilians, etc.)
Environmental issues are not taken as seriously, people believe the environment is sustainable and often they are afraid to think to deep into what might actually happen to the environment if not treated correctly. However economic issues are easy because it is directly going to impact the people. Environmental issues are future issues, economic issues are present issues.