Significant change is global infrastructure level changes, like no longer needing to commute to work. Changes that individuals really can’t control. Your point

Significant change is global infrastructure level changes, like no longer needing to commute to work. Changes that individuals really can’t control. Your point is bad because most people and systems will not act until they feel the negative effects, so a few million people carefully composting might allow them to keep behaving irresponsibly for a few days. Look at the relationship between the size of cars being sold and gas prices. Any slack your individual efforts introduce into the system will get chewed up by someone else.