The IPCC has consistently DOWNPLAYED the negative consequences of climate change, and reality keeps outpacing their worst case predictions year after year.
Every attempt to message the reality and consequences of climate change, and the possible avenues for blunting it, has been tried. From the sugarcoating "everything will be rosy and great and abundant, look at all the benefits of green industry" to the milquetoast watered-down try-to-please-everyone messaging of the major political parties, to the desperate attempts to communicate the brutal reality of what we're facing (and still failing to match the reality that is consistently worse).
None of it works.
1) People are selfish, myopic, and stupid. They think about their short term personal needs and wants above all else. Large scale coordination on this issue is virtually impossible, see the Prisoner's Dilemma. Human psychology is simply not fit for this task.
The satisficing nature of evolution means we are the dumbest possible animal that could otherwise achieve the technological civilization that we have, and this is another example where it really shows.
2) The wealthiest and most powerful people and corporations on Earth have spent decades pushing propaganda attempting to sow doubt about climate change, because genuine action on it is directly against their interests.
Those poor multi-trillion dollar industries underpinning all modern society and power structures are the altruistic, honest bastions of truth, it's those evil corrupt post docs on minimum wage that are the truly corrupt and greedy ones, twisting the truth for their own financial gain and machiavellian ends!
And they've been far more effective than the cigarette companies of the early 20th century could have ever dreamed.
