Individual actions can't solve a collective problem. I can go vegetarian, walk everywhere, never take a plane or ship for my entire life and all of that savings

Individual actions can't solve a collective problem. I can go vegetarian, walk everywhere, never take a plane or ship for my entire life and all of that savings would be eaten up by a supertanker burning bunker fuel going a few miles off course or a chemical company vomiting waste into a river. The only way to solve these problems is at the national government and international organization level.