Thanks for posting this link. The linked report demonstrates the issue precisely.
On page 7 of the pdf summary report, it talks about the "bad stuff" that is predicted due to climate change. The major data points given are that crop yields will fall. This is in direct opposition to all the science I have read on the topic, for example Obama's EPA.gov site says "Agriculture and fisheries are highly dependent on the climate. Increases in temperature and carbon dioxide (CO2) can increase some crop yields in some places."
They try to paint a highly negative picture, but then provide the data in chart below that. Crop yields are steadily increasing.
Whenever I look into the source data, I see this kind of thing. Dire consequences predicted, but then even a cursory examination of the data show that the prediction has been falsified.
*) Fish failures predicted - real data shows that the fish simply move north/south (https://www.epa.gov/climate-impacts/climate-impacts-agriculture-and-food-supply)
*) Crop failure predicted - real data shows steady growth of crop yield (https://www.epa.gov/climate-impacts/climate-impacts-agriculture-and-food-supply)
*) Land flooding predicted - real data shows that the land movement effects swamp any issues with the sea rising (Florida has no problem, Louisiana has major problems) (https://www.epa.gov/climate-impacts/climate-impacts-coastal-areas)
Does anyone have a prediction of "bad stuff" made in an IPCC report that has actually happened? (I am limiting "bad stuff" to things that my children's children will actually care about) The old reports are now old enough that there predictions should be apparent by now. I have reviewed the reports, and the cases I looked at (sea level rise, crop failures, fishing) were all falsified by what happened in reality.
If the IPCC has no predictive power, why should we use it to guide policy?