Robert Lifton calls it the climate swerve. He argues that, just as happened with the opposition to nuclear war, "a major historical change in consciousness that is neither predictable nor orderly" may be upon us with respect to climate change.
His evidence for this is slim - a Yale survey showing increased certainty that the earth is warming. Given the entrenched political opposition in the USA, we are still years away from a world where democrats and republicans stop debating the existence of climate change and start debating what to do about it.
However, this piece does highlight the tremendous potential for non-linear responses if social movements can shift public values on big issues, as has happened with nuclear conflict. The changes then cascade throughout all levels of society.
With both the nuclear and climate threats, the swerve in awareness has had a crucial ethical component. People came to feel that it was deeply wrong, perhaps evil, to engage in nuclear war, and are coming to an awareness that it is deeply wrong, perhaps evil, to destroy our habitat and create a legacy of suffering for our children and grandchildren.