1. Reasons
1.1. Human
1.1.1. Pollution
1.1.1.1. Air pollution
1.1.1.1.1. smoke from factories
1.1.1.2. Oil spills
1.1.1.2.1. ship accidents
1.1.1.3. water pollution
1.1.1.3.1. throwing grabage and plastic
1.1.1.3.2. chemicals from factories
1.1.1.4. mining
1.1.1.5. land fills
1.1.2. Deforestation
1.1.2.1. Agriculture
1.1.2.2. food
1.1.2.3. housing
1.1.3. Acidification
1.1.3.1. acid rains
1.1.4. Hunting
1.1.4.1. trading and selling fur
1.1.4.2. illiegal activities
1.1.4.3. poaching
1.1.4.4. illegal wild life trade
1.1.5. Invasive species
1.1.5.1. Taking animals to different habitat
1.1.6. Accidents
1.1.6.1. traffic
1.1.6.2. explosions
1.2. Natural
1.2.1. floods
1.2.1.1. tsunamis
1.2.2. droughts
1.2.3. forest fires
1.2.4. tornadoes
1.2.5. climate change
1.2.6. Earthquakes
1.2.7. Diseases
1.2.8. volcanoes
2. List
2.1. sloth
2.2. gorillas
2.3. leopards
2.4. pandas
2.5. blue whales
2.6. white rhino
3. Saving endangered animals
3.1. Breeding and captivating in zoos
3.2. strict laws and punishments
3.3. Animal adoption or restoration
3.4. Aforestation
3.5. Reducing pollution
3.6. Making ecopassages
3.7. Making poaching illegal
3.8. Wildlife funding programs
3.9. Preserving habitats
3.10. Making conservation areas
3.11. fight for animal rights
3.12. less use of chemicals
4. steps each one of us can take
4.1. 5R's
4.1.1. reuse, recycle, rebuild, rethink
4.2. plant trees
4.3. stop animal cruelty
4.3.1. stop animal sports
4.3.2. say no entertainment
4.3.3. reduce animal products
4.4. donate to WWF
4.5. animal friendly homes
4.5.1. birdfeeders