One of the most widely quoted and most alarmist passages in the main 2007 report was a warning that, by 2020, global warming could reduce crop yields in some countries in Africa by 50 per cent
The origin of this claim was a report written for a Canadian advocacy group by Ali Agoumi, a Moroccan academic who draws part of his current income from advising on how to make applications for "carbon credits"
As his primary sources he cited reports for three North African governments. But none of these remotely supported what he wrote.
The nearest any got to providing evidence for his claim was one for the Moroccan government, which said that in serious drought years, cereal yields might be reduced by 50 per cent. The report for the Algerian government, on the other hand, predicted that, on current projections, "agricultural production will more than double by 2020".
The fossil record is clear; as temperature and carbon dioxide increase, plants grow larger and faster!