We are always people that are in the making, constantly adapting to accommodate the roads we walk. As we learn, it changes us. As we go about our course, we grow, and prune everything around us; friends, beliefs, desires. Our past experiences plant the seeds needed for our future roads, with all its turns, speed, and treachery.
When you talk with people, one of the arguments they'll throw back at you is that the climate has always changed, and that is absolutely right. It's the rate of change that is the problem right now. It's changing so quickly that it exceeds the adaptive capacity of some species.
Those who cannot change their minds cannot change anything.