Conservation campaigns often have little effect because they don't understand what actually drives human behaviour - they focus on changing attitudes through education, but often fail to actually change peoples behaviour. For example its much easier to use an education campaign to get people to think recycling is good, than to actually get them to recycle. Other psychological factors clearly are at play.
In the past many scientists and economists presumed we were purely rational beings, self-promoting our own interests with perfect knowledge of the consequences of our actions. These assumptions are really influential: many world governments rely on our self-interest and perfect decision-making to change our behaviour, hoping rational arguments and penny-savings will alter our trajectory towards crisis.