First, why the big drop in 2010?
According to FAO:
The 2010 lower global hunger number resulted largely from renewed economic growth expected this year — particularly in developing countries — and the drop in food prices since mid-2008.Thus, economic growth means less hungry people.
Second, why the big spike in 2009?
According to FAO last year (PDF), one primary reason was the cost of fuel:
Given the increased importance of biofuels and the new linkages between agricultural and energy markets, increased cereal yields, if achieved, may not necessarily continue to lead to lower cereal prices. Because the world energy market is so much larger than the world grain market, grain prices may be determined by oil prices in the energy market as opposed to being determined by grain supply.Thus, higher priced energy means more hungry people.
These twin dynamics illustrate several important boundary conditions for a successful climate policy -- that is, one focused on stabilizing atmospheric concentrations of carbon dioxide at a low level. The boundary conditions are that (a) economic growth must not be slowed, and (b) energy cannot be made appreciably more expensive. (You need only have a look at the Kaya Identity to see why this is the case.)
Policies that reduce economic growth and/or make energy more expensive will lead to more hungry people around the world. This is just an empirical reality.
The FAO notes:
Two thirds of the world's undernourished live in just seven countries — Bangladesh, China, the Democratic Republic of Congo, Ethiopia, India, Indonesia and Pakistan.In 2008, those seven countries accounted for almost 30% of total global carbon dioxide emissions, a proportion that is growing rapidly. The realities of poverty alone help to explain why India and China, in particular, have approached climate policy as a lower priority than economic growth.
Yukiko Omura, Vice President of the International Fund for Agricultural Development, explains that,
"the world's hungry are not just numbers. They are people — poor women and men struggling to bring up their children and give them a better life; and they are youth trying to build a future for themselves. It is ironic that the majority of them actually live in rural areas of developing countries. Indeed, over 70 percent of the world's extremely poor — those people who live on less than US$ one a day — live in rural areas. That's a billion people, and four out of five of them are farmers to some extent or the other."In this context, arguments about long-term costs and benefits and unaccounted for externalities -- no matter how theoretically valid -- simply will not trump the immediate challenges of reducing hunger. To put more bluntly -- few are going to be willing to increase (or arrest the decrease of) the number of starving people around the world to further an emissions reductions agenda.
So we'll simply have to find another way -- one that prioritizes (rather than slows) economic growth and one that focuses on making energy less costly. Until we do so, climate policy will continue to make little progress. It is an iron law.