The Green Revolution Study Guide

37-1 Describe the three primary characteristics of the Green Revolution.
37-2 Explain the positive consequences of the Green Revolution on human populations and the environment.
37-3 Explain the negative consequences of the Green Revolution on human populations and the environment.

First Agricultural Revolution: Marked by the domestication of plants and animals and the development of agriculture.
Second Agricultural Revolution: Coincided with the Industrial Revolution; major enhancements through new technologies and boosted agricultural efficiency.
Third Agricultural Revolution: Marked by significant advancements in agricultural practices, particularly during the 1960s and 1970s, emphasizing the Green Revolution.

Green Revolution: The U.S.-supported initiative leading to the development of high-yield seed varieties and agricultural technologies, primarily aimed at improving productivity in less developed countries.
- Focused on high-yielding varieties of cereal grains through scientific advances in plant breeding, synthetic fertilizers, and pesticides.
- Key figure: Dr. Norman Borlaug.

Beginning: Early 1940s in Mexico, primarily focused on wheat.
Key developments:
- Distribution of high-yield wheat seeds within seven years.
- Subsequent development of maize and other grains.
Crossbreeding: A key technique involving mixing different species/varieties to create hybrids (e.g., IR8 rice hybrid).
- Hybrid: Offspring resulting from crossing different species or varieties.
Fast improvements in seed yield compared to traditional domestication processes.
- Traditional maize took thousands of years to develop; high-yield varieties took less than a decade.
- Example: IR8 rice exhibited higher yields and genetic resistance to pests.

Historical context: Traditional farming utilized natural fertilizers (manure, ashes).
Scientific advancement led to understanding of critical nutrients (nitrogen, phosphorus, and potassium).
Green Revolution required substantial synthetic input to achieve high yields:
- Plants needed significant amounts of fertilizers and irrigation.
- Hybrid seeds had lower resistance to pests requiring chemicals.
Impact: Increased costs for farmers but potential larger harvests.

Essential for sustaining high crop yields through consistent watering.
Traditional irrigation depended on seasonal rains; modern practices include building irrigation infrastructure (e.g., dams, pumps).
Practices like double-cropping (planting multiple crops on the same land yearly) emerged in response to irrigation.
- Increased productivity necessitated mechanization (tractors, machinery).
Issues arose due to high maintenance costs of machines leading to reliance on outdated means (e.g., water buffalo).

Example: A small community in northeastern Thailand increased productivity through Green Revolution techniques.
Overall, rice production in Asia grew by 66% from 1965 to 1985.
Multicropping allowed for rapid planting cycles enhancing food production and economic stability in countries like Thailand and India.

Green Revolution significantly reduced starvation rates.
- 1950: 55% of people in less economically developed countries faced hunger.
- Current estimates show over 80% have adequate diets.

Agricultural land only covers 33.3% of Earth's surface.
Green Revolution facilitated high yields without the need to expand agricultural land, crucial amidst urban encroachment.

Benefits mostly accrued to wealthier farmers; poor farmers could not afford new technologies exacerbating the wealth gap.
Many poor farmers migrated to cities seeking better economic opportunities, leading to urban issues (housing, sanitation).

Transition to commercial farming reduced local food production and altered land-use.
Decreased crop diversity increased vulnerability to pests and reduced food security.
Loss of traditional seeds that were locally adapted led to diminished genetic variety.

The Green Revolution had limited effects in Africa due to different agricultural roots (e.g., cassava, sorghum) and poorer soil fertility.
Notable attempts to improve food production in areas like Gambia were slow but improving.

Chemical use led to groundwater contamination and health issues for farmworkers.
- Environmental contamination: Chemical buildup from fertilizers and pesticides.
- Concerns about superpests evolving from increased pesticide use.
Irrigation challenges:
- Soil Salinization: Increased salt concentration damaging to crop productivity.
- Groundwater Depletion: High irrigation water needs leading to long-term water scarcity.

Green Revolution: U.S.-supported efforts to develop high-yield seeds and agricultural technologies.
Crossbreeding: Mixing different species or varieties to produce hybrids.
Hybrid: Offspring resulting from the breeding of distinct species or varieties.
Double-Cropping: Planting another crop immediately after harvesting the first on the same land.
Hierarchical Diffusion: The process of ideas and technologies spreading from important individuals or communities to others.
Soil Salinization & Soil Salinity: Issues resulting from improper irrigation practices leading to increased salt in the soil.
Environmental Contamination: The buildup of toxic chemicals due to agricultural practices.