English subtitles

← The other inconvenient truth

A skyrocketing demand for food means that agriculture has become the largest driver of climate change, biodiversity loss and environmental destruction. At TEDxTC Jonathan Foley shows why we desperately need to begin "terraculture" -- farming for the whole planet. (Filmed at TEDxTC.)

Get Embed Code
28 Languages

Showing Revision 6 created 07/31/2013 by Thu-Huong Ha.

  1. Tonight, I want to have a conversation about
  2. this incredible global issue
  3. that's at the intersection of land use, food and environment,
  4. something we can all relate to,
  5. and what I've been calling the other inconvenient truth.
  6. But first, I want to take you on a little journey.

  7. Let's first visit our planet, but at night,
  8. and from space.
  9. This is what our planet looks like from outer space
  10. at nighttime, if you were to take a satellite and travel
  11. around the planet. And the thing you would notice first,
  12. of course, is how dominant the human presence
  13. on our planet is.
  14. We see cities, we see oil fields,
  15. you can even make out fishing fleets in the sea,
  16. that we are dominating much of our planet,
  17. and mostly through the use of energy
  18. that we see here at night.
  19. But let's go back and drop it a little deeper
  20. and look during the daytime.
  21. What we see during the day is our landscapes.
  22. This is part of the Amazon Basin, a place called Rondônia

  23. in the south-center part of the Brazilian Amazon.
  24. If you look really carefully in the upper right-hand corner,
  25. you're going to see a thin white line,
  26. which is a road that was built in the 1970s.
  27. If we come back to the same place in 2001,
  28. what we're going to find is that these roads
  29. spurt off more roads, and more roads after that,
  30. at the end of which is a small clearing in the rainforest
  31. where there are going to be a few cows.
  32. These cows are used for beef. We're going to eat these cows.
  33. And these cows are eaten basically in South America,
  34. in Brazil and Argentina. They're not being shipped up here.
  35. But this kind of fishbone pattern of deforestation
  36. is something we notice a lot of around the tropics,
  37. especially in this part of the world.
  38. If we go a little bit further south in our little tour of the world,

  39. we can go to the Bolivian edge of the Amazon,
  40. here also in 1975, and if you look really carefully,
  41. there's a thin white line through that kind of seam,
  42. and there's a lone farmer out there
  43. in the middle of the primeval jungle.
  44. Let's come back again a few years later, here in 2003,
  45. and we'll see that that landscape actually looks
  46. a lot more like Iowa than it does like a rainforest.
  47. In fact, what you're seeing here are soybean fields.
  48. These soybeans are being shipped to Europe and to China
  49. as animal feed, especially after the mad cow disease scare
  50. about a decade ago, where we don't want to feed animals
  51. animal protein anymore, because that can transmit disease.
  52. Instead, we want to feed them more vegetable proteins.
  53. So soybeans have really exploded,
  54. showing how trade and globalization are
  55. really responsible for the connections to rainforests
  56. and the Amazon -- an incredibly strange
  57. and interconnected world that we have today.
  58. Well, again and again, what we find as we look

  59. around the world in our little tour of the world
  60. is that landscape after landscape after landscape
  61. have been cleared and altered for growing food
  62. and other crops.
  63. So one of the questions we've been asking is,

  64. how much of the world is used to grow food,
  65. and where is it exactly, and how can we change that
  66. into the future, and what does it mean?
  67. Well, our team has been looking at this on a global scale,
  68. using satellite data and ground-based data kind of to track
  69. farming on a global scale.
  70. And this is what we found, and it's startling.
  71. This map shows the presence of agriculture
  72. on planet Earth.
  73. The green areas are the areas we use to grow crops,
  74. like wheat or soybeans or corn or rice or whatever.
  75. That's 16 million square kilometers' worth of land.
  76. If you put it all together in one place,
  77. it'd be the size of South America.
  78. The second area, in brown, is the world's pastures
  79. and rangelands, where our animals live.
  80. That area's about 30 million square kilometers,
  81. or about an Africa's worth of land,
  82. a huge amount of land, and it's the best land, of course,
  83. is what you see. And what's left is, like,
  84. the middle of the Sahara Desert, or Siberia,
  85. or the middle of a rain forest.
  86. We're using a planet's worth of land already.
  87. If we look at this carefully, we find it's about 40 percent
  88. of the Earth's land surface is devoted to agriculture,
  89. and it's 60 times larger
  90. than all the areas we complain about,
  91. our suburban sprawl and our cities where we mostly live.
  92. Half of humanity lives in cities today,
  93. but a 60-times-larger area is used to grow food.
  94. So this is an amazing kind of result,
  95. and it really shocked us when we looked at that.
  96. So we're using an enormous amount of land for agriculture,

  97. but also we're using a lot of water.
  98. This is a photograph flying into Arizona,
  99. and when you look at it, you're like,
  100. "What are they growing here?" It turns out
  101. they're growing lettuce in the middle of the desert
  102. using water sprayed on top.
  103. Now, the irony is, it's probably sold
  104. in our supermarket shelves in the Twin Cities.
  105. But what's really interesting is, this water's got to come
  106. from some place, and it comes from here,
  107. the Colorado River in North America.
  108. Well, the Colorado on a typical day in the 1950s,
  109. this is just, you know, not a flood, not a drought,
  110. kind of an average day, it looks something like this.
  111. But if we come back today, during a normal condition
  112. to the exact same location, this is what's left.
  113. The difference is mainly irrigating the desert for food,
  114. or maybe golf courses in Scottsdale, you take your pick.
  115. Well, this is a lot of water, and again, we're mining water
  116. and using it to grow food,
  117. and today, if you travel down further down the Colorado,
  118. it dries up completely and no longer flows into the ocean.
  119. We've literally consumed an entire river in North America
  120. for irrigation.
  121. Well, that's not even the worst example in the world.

  122. This probably is: the Aral Sea.
  123. Now, a lot you will remember this from your geography classes.
  124. This is in the former Soviet Union
  125. in between Kazakhstan and Uzbekistan,
  126. one of the great inland seas of the world.
  127. But there's kind of a paradox here, because it looks like
  128. it's surrounded by desert. Why is this sea here?
  129. The reason it's here is because, on the right-hand side,
  130. you see two little rivers kind of coming down
  131. through the sand, feeding this basin with water.
  132. Those rivers are draining snowmelt from mountains
  133. far to the east, where snow melts, it travels down the river
  134. through the desert, and forms the great Aral Sea.
  135. Well, in the 1950s, the Soviets decided to divert that water
  136. to irrigate the desert to grow cotton, believe it or not,
  137. in Kazakhstan, to sell cotton to the international markets
  138. to bring foreign currency into the Soviet Union.
  139. They really needed the money.
  140. Well, you can imagine what happens. You turn off
  141. the water supply to the Aral Sea, what's going to happen?
  142. Here it is in 1973,
  143. 1986,
  144. 1999,
  145. 2004,
  146. and about 11 months ago.
  147. It's pretty extraordinary.
  148. Now a lot of us in the audience here live in the Midwest.
  149. Imagine that was Lake Superior.
  150. Imagine that was Lake Huron.
  151. It's an extraordinary change.
  152. This is not only a change in water and

  153. where the shoreline is, this is a change in the fundamentals
  154. of the environment of this region.
  155. Let's start with this.
  156. The Soviet Union didn't really have a Sierra Club.
  157. Let's put it that way.
  158. So what you find in the bottom of the Aral Sea ain't pretty.
  159. There's a lot of toxic waste, a lot of things
  160. that were dumped there that are now becoming airborne.
  161. One of those small islands that was remote
  162. and impossible to get to was a site
  163. of Soviet biological weapons testing.
  164. You can walk there today.
  165. Weather patterns have changed.
  166. Nineteen of the unique 20 fish species found only
  167. in the Aral Sea are now wiped off the face of the Earth.
  168. This is an environmental disaster writ large.
  169. But let's bring it home.

  170. This is a picture that Al Gore gave me a few years ago
  171. that he took when he was in the Soviet Union
  172. a long, long time ago,
  173. showing the fishing fleets of the Aral Sea.
  174. You see the canal they dug?
  175. They were so desperate to try to, kind of, float the boats into
  176. the remaining pools of water, but they finally had to give up
  177. because the piers and the moorings simply couldn't
  178. keep up with the retreating shoreline.
  179. I don't know about you, but I'm terrified that future
  180. archaeologists will dig this up and write stories about
  181. our time in history, and wonder, "What were you thinking?"
  182. Well, that's the future we have to look forward to.
  183. We already use about 50 percent of the Earth's fresh water

  184. that's sustainable, and agriculture alone
  185. is 70 percent of that.
  186. So we use a lot of water, a lot of land for agriculture.
  187. We also use a lot of the atmosphere for agriculture.
  188. Usually when we think about the atmosphere,
  189. we think about climate change and greenhouse gases,
  190. and mostly around energy,
  191. but it turns out agriculture is one of the biggest emitters
  192. of greenhouse gases too.
  193. If you look at carbon dioxide from
  194. burning tropical rainforest,
  195. or methane coming from cows and rice,
  196. or nitrous oxide from too many fertilizers,
  197. it turns out agriculture is 30 percent of the greenhouse
  198. gases going into the atmosphere from human activity.
  199. That's more than all our transportation.
  200. It's more than all our electricity.
  201. It's more than all other manufacturing, in fact.
  202. It's the single largest emitter of greenhouse gases
  203. of any human activity in the world.
  204. And yet, we don't talk about it very much.
  205. So we have this incredible presence today of agriculture

  206. dominating our planet,
  207. whether it's 40 percent of our land surface,
  208. 70 percent of the water we use,
  209. 30 percent of our greenhouse gas emissions.
  210. We've doubled the flows of nitrogen and phosphorus
  211. around the world simply by using fertilizers,
  212. causing huge problems of water quality from rivers,
  213. lakes, and even oceans, and it's also the single biggest
  214. driver of biodiversity loss.
  215. So without a doubt, agriculture is
  216. the single most powerful force unleashed on this planet
  217. since the end of the ice age. No question.
  218. And it rivals climate change in importance.
  219. And they're both happening at the same time.
  220. But what's really important here to remember is that

  221. it's not all bad. It's not that agriculture's a bad thing.
  222. In fact, we completely depend on it.
  223. It's not optional. It's not a luxury. It's an absolute necessity.
  224. We have to provide food and feed and, yeah,
  225. fiber and even biofuels to something like seven billion people
  226. in the world today, and if anything,
  227. we're going to have the demands on agriculture
  228. increase into the future. It's not going to go away.
  229. It's going to get a lot bigger, mainly because of
  230. growing population. We're seven billion people today
  231. heading towards at least nine,
  232. probably nine and a half before we're done.
  233. More importantly, changing diets.
  234. As the world becomes wealthier as well as more populous,
  235. we're seeing increases in dietary consumption of meat,
  236. which take a lot more resources than a vegetarian diet does.
  237. So more people, eating more stuff, and richer stuff,
  238. and of course having an energy crisis at the same time,
  239. where we have to replace oil with other energy sources
  240. that will ultimately have to include some kinds of biofuels
  241. and bio-energy sources.
  242. So you put these together. It's really hard to see
  243. how we're going to get to the rest of the century
  244. without at least doubling global agricultural production.
  245. Well, how are we going to do this? How are going to

  246. double global ag production around the world?
  247. Well, we could try to farm more land.

  248. This is an analysis we've done, where on the left is where
  249. the crops are today, on the right is where they could be
  250. based on soils and climate, assuming climate change
  251. doesn't disrupt too much of this,
  252. which is not a good assumption.
  253. We could farm more land, but the problem is
  254. the remaining lands are in sensitive areas.
  255. They have a lot of biodiversity, a lot of carbon,
  256. things we want to protect.
  257. So we could grow more food by expanding farmland,
  258. but we'd better not,
  259. because it's ecologically a very, very dangerous thing to do.
  260. Instead, we maybe want to freeze the footprint

  261. of agriculture and farm the lands we have better.
  262. This is work that we're doing to try to highlight places
  263. in the world where we could improve yields
  264. without harming the environment.
  265. The green areas here show where corn yields,
  266. just showing corn as an example,
  267. are already really high, probably the maximum you could
  268. find on Earth today for that climate and soil,
  269. but the brown areas and yellow areas are places where
  270. we're only getting maybe 20 or 30 percent of the yield
  271. you should be able to get.
  272. You see a lot of this in Africa, even Latin America,
  273. but interestingly, Eastern Europe, where Soviet Union
  274. and Eastern Bloc countries used to be,
  275. is still a mess agriculturally.
  276. Now, this would require nutrients and water.
  277. It's going to either be organic or conventional
  278. or some mix of the two to deliver that.
  279. Plants need water and nutrients.
  280. But we can do this, and there are opportunities to make this work.
  281. But we have to do it in a way that is sensitive

  282. to meeting the food security needs of the future
  283. and the environmental security needs of the future.
  284. We have to figure out how to make this tradeoff between
  285. growing food and having a healthy environment work better.
  286. Right now, it's kind of an all-or-nothing proposition.

  287. We can grow food in the background --
  288. that's a soybean field —
  289. and in this flower diagram, it shows we grow a lot of food,
  290. but we don't have a lot clean water, we're not storing
  291. a lot of carbon, we don't have a lot of biodiversity.
  292. In the foreground, we have this prairie
  293. that's wonderful from the environmental side,
  294. but you can't eat anything. What's there to eat?
  295. We need to figure out how to bring both of those together
  296. into a new kind of agriculture that brings them all together.
  297. Now, when I talk about this, people often tell me,

  298. "Well, isn't blank the answer?" -- organic food,
  299. local food, GMOs, new trade subsidies, new farm bills --
  300. and yeah, we have a lot of good ideas here,
  301. but not any one of these is a silver bullet.
  302. In fact, what I think they are is more like silver buckshot.
  303. And I love silver buckshot. You put it together
  304. and you've got something really powerful,
  305. but we need to put them together.
  306. So what we have to do, I think, is invent a new kind

  307. of agriculture that blends the best ideas
  308. of commercial agriculture and the green revolution
  309. with the best ideas of organic farming and local food
  310. and the best ideas of environmental conservation,
  311. not to have them fighting each other but to have them
  312. collaborating together to form a new kind of agriculture,
  313. something I call "terraculture," or farming for a whole planet.
  314. Now, having this conversation has been really hard,

  315. and we've been trying very hard to bring these key points
  316. to people to reduce the controversy,
  317. to increase the collaboration.
  318. I want to show you a short video that does kind of show
  319. our efforts right now to bring these sides together
  320. into a single conversation. So let me show you that.
  321. (Music)
  322. ("Institute on the Environment, University of Minnesota: Driven to Discover")
  323. (Music)
  324. ("The world population is growing
  325. by 75 million people each year.
  326. That's almost the size of Germany.
  327. Today, we're nearing 7 billion people.
  328. At this rate, we'll reach 9 billion people by 2040.
  329. And we all need food.
  330. But how?
  331. How do we feed a growing world without destroying the planet?
  332. We already know climate change is a big problem.
  333. But it's not the only problem.
  334. We need to face 'the other inconvenient truth.'
  335. A global crisis in agriculture.
  336. Population growth + meat consumption + dairy consumption + energy costs + bioenergy production = stress on natural resources.
  337. More than 40% of Earth's land has been cleared for agriculture.
  338. Global croplands cover 16 million km².
  339. That's almost the size of South America.
  340. Global pastures cover 30 million km².
  341. That's the size of Africa.
  342. Agriculture uses 60 times more land than urban and suburban areas combined.
  343. Irrigation is the biggest use of water on the planet.
  344. We use 2,800 cubic kilometers of water on crops every year.
  345. That's enough to fill 7,305 Empire State Buildings every day.
  346. Today, many large rivers have reduced flows.
  347. Some dry up altogether.
  348. Look at the Aral Sea, now turned to desert.
  349. Or the Colorado River, which no longer flows to the ocean.
  350. Fertilizers have more than doubled the phosphorus and nitrogen in the environment.
  351. The consequence?
  352. Widespread water pollution
  353. and massive degradation of lakes and rivers.
  354. Surprisingly, agriculture is the biggest contributor to climate change.
  355. It generates 30% of greenhouse gas emissions.
  356. That's more than the emissions from all electricity and industry,
  357. or from all the world's planes, trains and automobiles.
  358. Most agricultural emissions come from tropical deforestation,
  359. methane from animals and rice fields,
  360. and nitrous oxide from over-fertilizing.
  361. There is nothing we do that transforms the world more than agriculture.
  362. And there's nothing we do that is more crucial to our survival.
  363. Here's the dilemma...
  364. As the world grows by several billion more people,
  365. We'll need to double, maybe even triple, global food production.
  366. So where do we go from here?
  367. We need a bigger conversation, an international dialogue.
  368. We need to invest in real solutions:
  369. incentives for farmers, precision agriculture, new crop varieties, drip irrigation,
  370. gray water recycling, better tillage practices, smarter diets.
  371. We need everyone at the table.
  372. Advocates of commercial agriculture,
  373. environmental conservation,
  374. and organic farming...
  375. must work together.
  376. There is no single solution.
  377. We need collaboration,
  378. imagination,
  379. determination,
  380. because failure is not an option.
  381. How do we feed the world without destroying it?
  382. Yeah, so we face one of the greatest grand challenges
  383. in all of human history today:
  384. the need to feed nine billion people
  385. and do so sustainably and equitably and justly,
  386. at the same time protecting our planet
  387. for this and future generations.
  388. This is going to be one of the hardest things
  389. we ever have done in human history,
  390. and we absolutely have to get it right,
  391. and we have to get it right on our first and only try.
  392. So thanks very much. (Applause)