the communication open. I was told earlier this year by someone I thought relatively smart, that I was not to bother my sweet little head on this as no doubt Congress has it covered. Yeesh. So, no, don't engage with those who do not want to know this. It's a tough, tough truth to face -- everyone will come to it in their own way, their own time. If someone has trouble addressing hard truths in their lives overall - this will likely not be something they will take in easily.
Find a group == the CCL and Climate Reality groups have tremendous resources on discussing this with others who truly do not know what's going on and want to know.