1. Food Efficiency

2. Food Efficiency The effectiveness of different types of agriculture
Measures the quantity of food produced
In a given area
With limited energy and resources
Ideal crops produce large amounts of food in very little space using very little energy………with little impact on the environment.

3. Food efficiency
More energy, water, and land is used to produce a Calorie of food from an animal than a plant.

4. Yield
Amount of crops produced per area of land

5. Old vs New food Researchers are
Looking for crops that grow in a variety of climates
Crops that do not require fertilizer
Crops that do not require pesticides
Crops that do not require freshwater

6. World Food Problems Some people are malnourished because
They do not get enough food
More food is needed each year
Food production is not increasing as fast as the population

7. World Food Problem Worldwide….food is not divided equally
Malnutrition is a result of poverty
Even in the U.S.

8. World Food Problem Wars and political strife cause malnutrition
Food transportations is interrupted

9. World Food Problem Prolonged drought decreases crop yield
Irrigation helps with drought but not all countries have this system.
Drought affects people who have their food grown locally
Drought means no crops this year and NO SEEDS FOR NEXT YEAR

10. World Food Problems Most populations can survive one drought
From food grown the previous year
Several years of drought cause severe problems
Soil becomes less able to support food crops.

11. Green revolution Between 1950 and 1970 an increase in crop yield from
New crop varieties
Modern agriculture techniques

12. Green Revolution Problems
Larger yield require
larger amounts of water, fertilizers, and pesticide
Machine irrigation systems
More chemicals
This degrades the soil.
Grain production is slowly decreasing since 1990.

13. Green Revolution Problem
Negative impact on subsistence farmers
Before the revolution, subsistence farmers produced most of the world’s crops
Cost of new equipment, water, and chemicals