1. Types
1.1. Deciduous Trees
1.1.1. Oak
1.1.1.1. Uses
1.1.1.1.1. Furniture
1.1.1.1.2. Flooring
1.1.1.1.3. Firewood
1.1.1.2. Habitat
1.1.1.2.1. Temperate and tropical forests
1.1.2. Maple
1.1.2.1. Uses
1.1.2.1.1. Syrup production
1.1.2.1.2. Furniture
1.1.2.2. Habitat
1.1.2.2.1. Northern Hemisphere
1.2. Evergreen Trees
1.2.1. Pine
1.2.1.1. Uses
1.2.1.1.1. Wood for construction
1.2.1.1.2. Pine nuts for food
1.2.1.2. Habitat
1.2.1.2.1. Northern Hemisphere, especially cold climates
1.2.2. Spruce
1.2.2.1. Uses
1.2.2.1.1. Christmas trees
1.2.2.1.2. Wood for construction
1.2.2.2. Habitat
1.2.2.2.1. Northern Hemisphere
2. Threats
2.1. Deforestation
2.1.1. Causes
2.1.1.1. Logging
2.1.1.2. Agriculture Expansion
2.1.2. Effects
2.1.2.1. Loss of Habitats
2.1.2.2. Soil Erosion
2.1.2.3. Climate Change
2.2. Forest Fire
2.2.1. Causes
2.2.1.1. Lightning
2.2.1.2. Human Activity
2.2.2. Prevention
2.2.2.1. Controlled Burn
2.2.2.2. Forest Management
2.3. Diseases and Pests
2.3.1. Emerald Ash Borer
2.3.2. Dutch Elm Disease