The association between food deprivation and social instability has been demonstrated again and again in recent history. Food riots are typically based on shortages due to price spikes, poor planning, or temporary crop shortages.
Imagine food riots in response to a permanent reduction in food production.
Further, imagine that there are no outside resources for relief.
The driving force behind the worldwide change comes from increased carbon dioxide in the atmosphere due to coal and oil based products. Once in the atmosphere, the majority of CO2 lingers for 20 to 200 years with the remainder sticking around for hundreds of thousands of years.
The IPCC report is a matter of scientific consensus. In as much as possible, the report mentions the likelihood of significant harm reduction as a result of a coordinated effort to reduce the rate of climate change and plan for the levels of disruption already written into the history of the remainder of the century.
The responsibility for the calamities awaiting us needs to be clearly assigned. When you hear pundits talk about how we're all responsible, that represents a misinformed opinion or propaganda by the elites that enabled this most dismal future.
The failure to reach consensus until the apparent point of no return required deliberate denial of the facts as they emerged. The climate change deniers who argue from no scientific basis other than the title of scientist somewhere receive vast support from those who have no desire to clean up cars, factories, toxic waste production, etc. The media that claims that there are two sides to every issue are in the service of the financial and political elite that can only imagine a world with shrinking resources and wealth. Through their lack of imagination, denial, and negligence, they've made their vision come true.
It's their fault.