"Why" falls into dangerous conversational territory in my opinion. That of feelings. You start asking why life at all? Philosophy! Crazy stuff but it can be fun

"Why" falls into dangerous conversational territory in my opinion. That of feelings. You start asking why life at all? Philosophy! Crazy stuff but it can be fun. But I don't think there are any "why"s big enough to make people accept a small amount of personal inconvenience. It just isn't in humans to operate on a macro Earth sized scale. The only way to achieve it is create the alternatives and make them more attractive than the current status quo or force the change through government regulations. You see plenty of people helping out on one cause or another but no one can do all the things all the time. So small changes in culture are what works best. For example the local anti-smoking change which happened only recently was bolstered by the ban on indoor smoking in my city.