Trying to scare people into behavior does not work very well. The Catholic Church spent centuries threatening people with eternal hell if they had extra-marital sex, and people still had extra-marital sex. Studies have shown that abstinence only sex education results in more teen pregnancies. Thomas Malthus saw an impending famine and begged people to have fewer children. People did not listen.
What works is "magic science." A solution that allows people to behave the way hey do, and we come up with a solution that just works. Birth control has resulted in a decline in teen pregnancies and population stabilization where it is available. The green revolution is able to feed people, without most people having to do anything different in how they eat.
The other thing is that people don't really think this is a true emergency. An evidence for this is the quote "What if global warming is wrong and we made the planet better?" If it is a true emergency, we should be doing stuff that make the planet worse if it is wrong. We should be pushing nuclear power - even to the the point of reducing existing safety regulations. A Chernobyl every decade is preferable to global warming. Politically, we should be willing to trade existing environmental regulation for those which reduce CO2. For example, what if we traded the Endangered species act for a carbon tax?
Third, we should be pushing for research and funding for climate adaptation at his point. The focus has been on mitigation, but it should switch to adaptation. We should be working on scaling up and testing models of carbon sequestration and Geo engineering.
EDIT: Per cbennett's comment, changed prevention to mitigation and mitigation to adaptation to be more in line with official terminology.