How do we use it?How do we use it?

1. timber for paper, furniture, and home construction

1. timber for paper, furniture, and home construction

2. rich grassland to support livestock & farms

2. rich grassland to support livestock & farms

3. mineral resources to make everything (from electronics to engine power, etc.)

3. mineral resources to make everything (from electronics to engine power, etc.)

worldwide avg.: 1,800 cubic cm.

of wood per person each day.

worldwide avg.: 1,800 cubic cm.

of wood per person each day.

We use 3.5 times the average in the US.

Each year, one person cuts down a 30 m tall tree.

We use 3.5 times the average in the US.

Each year, one person cuts down a 30 m tall tree.

clearing trees from an area without replacing them.

clearing trees from an area without replacing them.

process of removing all trees

from an area

process of removing all trees

from an area

Disadvantage:Disadvantage:destroys wildlife,increases soil erosion; diminishesbeauty

destroys wildlife,increases soil erosion; diminishesbeauty

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Advantage:Advantage:least expensive,

fewer roads needed.

least expensive, fewer roads

needed.

cutting only middle-aged or

mature trees

cutting only middle-aged or

mature trees

Disadvantage:Disadvantage:expensive; more

roads cause more soil erosion.

expensive; more roads cause

more soil erosion.

Advantage:Advantage:less impact on

environment than clear-cutting

less impact on environment than

clear-cutting

Process of replacing trees

that have died or been cut down.

Process of replacing trees

that have died or been cut down.

Rangeland - essential for maintaining the

world’s food supply.

Rangeland - essential for maintaining the

world’s food supply.

ProblemsProblemsa. overgrazing - dry patches left or unwanted plants take over.b. desertification

a. overgrazing - dry patches left or unwanted plants take over.b. desertification

Public Rangelands

Improvement Act of 1978

Public Rangelands

Improvement Act of 1978

grazing management: a. limits animal herds

to sizes land can support

grazing management: a. limits animal herds

to sizes land can support

b. move herds in a way that will

protect the plants that support them.

b. move herds in a way that will

protect the plants that support them.