Climate Change and Food Security

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Global warming induced heat waves, drought, and flooding constitute a global food security emergency ​for us all today, ​to protect our near and long term future food security​- the world's top food producing regions of the temperate Northern hemisphere ​are now global warming & climate change vulnerable
Millions face starvation
​ as world warms say scientists
Changes in climate are already affecting the sustainability of agricultural systems and disrupting production
​Unless the emissions of GHGs are curbed .. changes in temperature, precipitation, and other climate variables will undoubtedly affect agriculture around the world
Position statement of the American Society of Agronomy Crop Science Society of America Soil Science Society of America​.
Climate change: how a warming world is a threat to our food supplies
Global warming is exacerbating political instability as tensions brought on by food insecurity rise. With research suggesting the issue can only get worse we examine the risks around the world. The Observer 13 April 2013


A. Calzadilla Aug 2013 Higher food prices are expected no matter which climate scenario.
A 1ºC increase in temperature decreases Kansas ​wheat yields nearly 21%.
A. Barkley Aug 2013
Food security weakening "on a scale we haven't seen"
​- expert 
Reuters June 2013
The 11,000 year period of relative climate stability in which agriculture developed is over. Lester Brown
IPCC AR5  2014 WG2 
Negative impacts of climate change on crop and terrestrial food production have been more common than positive impacts, which are evident in some high latitude regions.

Without adaptation local temperature increases of 1.0C (global average also 1.0C) above pre-industrial​ are projected to negatively impact yields for major crops (wheat rice and maize) in tropical and temperate regions.

​​With or  without adaptation, negative impacts on average yields become likely from the 2030s  with median yield  impacts of 0 to -2% per decade projected for the rest of the century , and after 2050 the risk of more  severe impacts increases. These impacts will occur in the context of rising crop  demand

Climate change will reduce crop yields sooner than we thought affecting all regions. Meta-analysis  Prof A. Challinor March 2014