9 Nov 2015 World Bank article Climate Change Could Put 100 Million People Back
Into Poverty by Destroying Farming. 900 million more could sink into poverty
IPCC 5th assessment 2014 Based on many studies covering a wide
range of regions and crops, negative impacts of climate change
on crop yields have been more common than positive impacts
(high confidence) WG2 SPM.
Without (successful) adaptation, local (/global is the same for 1.0C)
temperature increases in excess of about 1°C above pre-industrial
is projected to have negative effects on yields for the major crops (wheat, rice and maize) in both tropical and temperate regions(IPCC AR5 WG2 Ch7 Exec Summary p.3 final science draft).
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. IPCC AR5 WG2 Table 7-3.
September 2014 Scientists on drought: Scientists warn of 'megadroughts'
Nature Mar 2014 Climate change will reduce crop yields sooner than we thought.
National Geographic 20 Feb 2014
British Floods, California Drought: A Connection?
A wavy jet stream—and perhaps climate change—underlie recent weather extremes.
Most are becoming aware that the world is being hit by severely damaging increased extreme weather events. In particular these since 2000 have affected the world's best food producing regions of the Northern Hemisphere (NH).
The evidence amounts to causation since the publication of Potsdam Climate institute 2013 paper amplification of planetary waves and recent Northern Hemisphere weather extremes '... amplification of planetary waves and recent Northern Hemisphere weather extremes' on the NH climate dynamics at work.
We are already committed due systemic inertias to a global warming above 2.5C and on our current world economy at mid century.
Increasing world drought (especially N. hemisphere) has resulted in a global water crisis that is causing world grain reserves to fall and global food prices to become volatile. This in turn is causing a committed increasing global food crisis that is a global emergency (Center for Climate & Security Jan 2013)
Evidence suggests world drought has been increasing driven by global temperature increase as expected. Since 2000 the record shows an extraordinary increases in Northern hemisphere heat and drought. Today (Dec 2012) central US (great grain belt) in a three increasing year drought predicted to persist the April 2013.
In particular over the past decade, and 2012 especially, all the world's top food producing regions in the North hemisphere are being hit by drought.
21 August 2012 – "More consolidated efforts to combat the threat of climate change and counter its ripple effects on global food security are needed amid an intensifying global drought and increasing temperatures worldwide," the United Nations declared today.
With drought intensifying worldwide, UN calls for integrated climate policies.
"Climate change is projected to increase the frequency, intensity, and duration of droughts.
One quarter of the United States was experiencing exceptional drought while the entire country was facing its longest 12 month period in a drought since 1895."
India is "similarly experiencing a very serious droughts with countrywide rainfall of 17 per cent below normal. In Punjab, India’s breadbasket, rainfall was 70 per cent below normal."
According to the WMO, "severe drought also developed in parts of East Africa in late 2010 and continued through most of 2011 with the most severely affected areas encompassing the semi-arid regions eastern and northern Kenya, western Somalia, and southern border areas of Ethiopia.
In 2009, international climate experts gathered at the International Workshop on Drought and Extreme Temperatures in Beijing released their climate projections for the 21st century, forecasting an increase in the frequency of severe droughts in the continental USA and Mexico, the Mediterranean Basin, parts of northern China, across southern Africa and Australia and in parts of South America."
The world's best food producing regions are the Northern Hemisphere (NH)
CLIMATE EMERGENCY INSTITUTE
The health and human rights approach to climate change