Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to be earth friendly [title] Plant a tree. [step] One of the simplest things to do is to buy a tree and plant it. You will help reduce co2 emissions in the air and filter out the bad particles in the air.

Ending1: Big trees can be counted as " plants. " [title] Ask your parents to plant the tree! [step] Maybe they have a tree that's not big enough. Ending2: A good tree will grow about 5 feet (1.5 m) tall. [substeps] In the spring or early fall, a tree will reach up to 5 feet (1.5 m) tall. Ending3: Another benefit of planting a tree is that it creates a calm and peaceful atmosphere around you. [title] Planting flowers is a fun way to help the earth. Ending4: A tree also acts as a host for weather, so, it will help keep your environment from getting too cold. This is because it works with the environment better.

Answer format: ending1/ending2/ending3/ending4