Chapter
20. Chapter 20: Feeding the World - A Gene Revolution
What was the Green Revolution and what were its advantages and disadvantages?
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Guiding Question 20.3
What was the Green Revolution and what were its advantages and disadvantages?
Why You Should Care
In the mid-twentieth century, the Green Revolution was the name given to a period of rapid innovation in agricultural methods that allowed both developed and developing countries in Asia to drastically increase crop yields and avert the large-scale famines that seemed imminent in countries like India. It now seems that the Green Revolution was not a permanent solution for several reasons: Avoiding famine allowed populations to continue to grow and the demand for food to increase, such that the world is running out of arable (farmable) land; as standards of living rise in China, so does its citizens' demand for more meat in their diets, and meat requires more resources than vegetables. Also, most African countries were overlooked during the spread of the Green Revolution, and they are struggling to find more productive agricultural methods that their citizens can afford to employ. Lastly, the burgeoning surpluses of commodity crops produced in developed countries are not reaching people who need them. Even if they do reach people in need, crop exports do nothing to help them attain self-sufficiency and lasting food security and sovereignty, all of which help developing countries maintain a stable social order and quality of life for their people.
Test Your Vocabulary
Choose the correct term from the drop-down for each of the following definitions:
1. Strains of staple crops selectively bred to produce more grain than their natural counterparts, usually because they grow faster or larger or are more resistant to crop diseases, are .
2. The was a plant-breeding program in the mid-1900s that dramatically increased crop yields and led the way for mechanized, large-scale agriculture.
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1.
The blue line in the graph represents:
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2.
The rise in grain production starting in the late 1990s after two decades of relatively little change has been attributed to:
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Based on the information presented the graph, you could safely conclude that:
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4.
A loss of soil fertility can arise from excess run-off of _____.
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5.
Thought Question: There is a chance that growing only a few varieties of crops could mean the ‘extinction’ of traditional varieties that are no longer being grown. Why is that a cause for concern?
Just because a crop variety is successful and productive now, doesn't mean it will always be. Insect pests and plant diseases are always evolving and there's a chance that today's crop could be decimated next year. Resources could also be conserved if crop varieties that were more appropriate for local conditions were grown rather than the same one across continents.
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Thought Question: If you've ever noticed a crust of salt on the top of the potting medium of a houseplant, you've seen soil salinization. In agricultural settings it results from irrigation. In what sort of climates do you think soil salinization is the biggest problem?
Salts build up after irrigation water evaporates, leaving them behind. This is more likely to be a problem in arid climates, where there is not likely to be enough rainfall throughout the year to dissolve the salts.
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Thought Question: How can fertilizing soil leave it with fewer nutrients?
Adding fertilizer to soil stimulates rapid, extensive plant growth and production. This means that after the fertilizer is used, the plants will also take up what nutrients were naturally occurring in the soil. If the crops and the plants that produced them are removed from the field, they take the nutrients they extracted from the soil with them, leaving the soil poorer than before it was fertilized.