Food security and food production systems
For the major crops (wheat, rice, and maize) in tropical and temperate regions, climate change without adaptation is projected to
negatively impact production for local temperature increases of 2°C or more above late-20th-century levels, although individual
locations may benefit (medium confidence). Projected impacts vary across crops and regions and adaptation scenarios, with about 10% of
projections for the period 2030–2049 showing yield gains of more than 10%, and about 10% of projections showing yield losses of more than 25%, compared to the late 20th century. After 2050 the risk of more severe yield impacts increases and depends on the level of warming. See
Figure SPM.7. Climate change is projected to progressively increase inter-annual variability of crop yields in many regions. These projected
impacts will occur in the context of rapidly rising crop demand.
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