The analysis presented herein suggests that U. S. food insecurity due to climate
change, as reflected in production of commodity crops, may be avoided in the first
half of the 21st century by continuing adaptation measures of the past and by
shifting cropping regions. Although trends in yields, production, and exports
generally are up in the near term, some leveling off is projected by mid-century.
Furthermore, a wider range of uncertainty, particularly for maize and soybeans, is
estimated in export markets. This range could be exacerbated by increases in
climate extremes that are widely predicted by U. S. and international climate
science assessments. Both recent observations and future projections point to more
areas experiencing both droughts and precipitation periods of increased intensity.
By diverting financial resources from other areas, producers have successfully
adapted to most changes in climate over the last 40 years, and likely will continue
to adapt in next decade or two. Large differences among global models (e.g.,
annual precipitation produced by ECHAM vs. MIROC models for the central US
as shown in Figure 7) allow for a wide variety of future precipitation regimes in
major grain-producing regions. This report did not examine climate trends for the
latter half of the 21st century. However, Walthall et al. (2012) report that
temperature trends by mid century are projected to continue through 2100 unless
effective mitigation measures are instituted soon
The analysis presented herein suggests that U. S. food insecurity due to climatechange, as reflected in production of commodity crops, may be avoided in the firsthalf of the 21st century by continuing adaptation measures of the past and byshifting cropping regions. Although trends in yields, production, and exportsgenerally are up in the near term, some leveling off is projected by mid-century.Furthermore, a wider range of uncertainty, particularly for maize and soybeans, isestimated in export markets. This range could be exacerbated by increases inclimate extremes that are widely predicted by U. S. and international climatescience assessments. Both recent observations and future projections point to moreareas experiencing both droughts and precipitation periods of increased intensity.By diverting financial resources from other areas, producers have successfullyadapted to most changes in climate over the last 40 years, and likely will continueto adapt in next decade or two. Large differences among global models (e.g.,annual precipitation produced by ECHAM vs. MIROC models for the central USas shown in Figure 7) allow for a wide variety of future precipitation regimes inmajor grain-producing regions. This report did not examine climate trends for thelatter half of the 21st century. However, Walthall et al. (2012) report thattemperature trends by mid century are projected to continue through 2100 unlessโลกมาตรการบรรเทาสาธารณภัยมีผลบังคับใช้เร็ว ๆ นี้
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