Earth

1. plants

1.1. grow

1.2. protect

1.3. not to cut down trees

1.4. economic papers

2. soil

2.1. compost heap

2.2. collect garbage

3. energy

3.1. use solar panels

3.2. to turn off the lights

3.3. use rechargeable batteries instead of disposable

4. 3 r-s

4.1. reduce

4.2. recycle

4.3. refuse

5. Water

5.1. conserve

5.2. short shower

6. air

6.1. electric cars

6.2. go a walk

6.3. ride a bike

7. animals

7.1. don't kill

7.2. vegans

7.3. man made fur