It's like the passengers who won't put their seat belt on during flight or release it as soon as the wheels touch. It would literally take them being slammed against the fuselage and breaking bones to make them understand the danger. With climate change, many people won't "believe" it until it negatively affects them in a way they can't work around. When you are mid flight halfway across the fuselage, it's too late to put your seatbelt on.