Measuring*the*effects*of*anthropogenic*CO2 … · Many*crops*lose*nutrients*under*550*ppmCO 2...

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Measuring the effects of anthropogenic CO 2 emissions on global nutrient intakes Matt Smith Harvard T.H. Chan School of Public Health

Transcript of Measuring*the*effects*of*anthropogenic*CO2 … · Many*crops*lose*nutrients*under*550*ppmCO 2...

Page 1: Measuring*the*effects*of*anthropogenic*CO2 … · Many*crops*lose*nutrients*under*550*ppmCO 2 Source:Myers!et!al.(2014), Medek!et!al.(2017) •

Measuring  the  effects  of  anthropogenic  CO2  emissions  on  global  nutrient  intakes    

Matt  Smith  Harvard  T.H.  Chan  School  of  Public  Health  

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CO2  emissions  are  growing  steadily  

Source:  IPCC  (2013),  Boden  et  al.  (2016),  Houghton  et  al.  (2012)  

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Putting  more  CO2  in  the  atmosphere  

Source:  IPCC  (2013)  

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Many  crops  lose  nutrients  under  550  ppm  CO2  

Source:  Myers  et  al.  (2014),  Medek  et  al.  (2017)  

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•  Problem  –  Globally,  our  dietary  supply  of  nutrients  is  dependent  on    

CO2-­‐affected  crops:  

–  Poorest  countries  are  most  reliant  on  plants  for  nutrition  –  Deficiencies  for  these  nutrients  are  high  

 •  Approach    – With  current  diets,  remove  nutrients  lost  under  higher  CO2    –  Identify  countries  at  highest  risk  for  increased  deficiency   5  

Who  is  affected,  and  by  how  much?  

Iron  (bioavailable)   63%  

Zinc   51%  

Protein  (digestible)   43%  

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Source:  Myers  et  al.  (2015),  Medek  et  al.  (2017),  Smith  et  al.  (in  review),  Smith  and  Myers  (in  prep.)  

Risk  of  lost  nutrients  in  a  higher-­‐CO2  world  

High  risk  in  South  Asia,  Middle  East  and  Africa  

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Source:  Myers  et  al.  (2015),  Medek  et  al.  (2017),  Smith  et  al.  (in  review),  Smith  and  Myers  (in  prep.)  

 658M  children  under  5  

and  women  of  childbearing  age  

are  in  moderate-­‐to-­‐high  risk  countries  

(27%  of  global  total)    

Risk  of  lost  nutrients  in  a  higher-­‐CO2  world  


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