Short answers, pulled from the story.
The 2003 European heatwave caused 13 billion euros in uninsured agricultural losses. This event marked a turning point where extreme weather began to visibly disrupt food production across the continent.
Climate-induced intensification of extreme weather decreased millet yields by 10, 20% and sorghum yields by 5, 15%. These specific regional failures demonstrated that historical data could no longer be relied upon for future planning.
Doubling carbon dioxide levels results in an 8% decline on average in the concentration of minerals within plant tissues. A 2014 meta-analysis showed that crops exposed to elevated carbon dioxide levels at various latitudes have lower density of several minerals such as magnesium, iron, zinc, and potassium.
The IPCC Sixth Assessment Report suggested that by 2050, the number of people at risk of hunger will increase under all scenarios by between 8 and 80 million people. Nearly all of them reside in Sub-Saharan Africa, South Asia, and Central America.
Low-lying areas like Bangladesh, India, and Vietnam face major rice crop losses if sea levels rise as expected by the end of the century. Saltwater intrusion into freshwater wells occurs when concentration exceeds 2, 3%, rendering wells unusable.