Explanation:

- Tree plantation is the practice of transplanting saplings or seeds:

This focuses on increasing greenery and contributes positively to the environment.

- Planting trees can be a rewarding and fruitful activity:

This highlights the personal and global benefits of engaging in tree-planting initiatives.

- Not only is it ecologically beneficial for this planet:

ecologically is the correct word here. It emphasizes the environmental advantages, such as improving air quality and enhancing natural habitats.

- It contributes to helping create an environmentally friendly place to live:

Trees are vital in absorbing pollutants and providing cleaner air for communities.

- As trees help reduce pollutant levels:

This focuses on how trees improve air quality by filtering pollutants and producing oxygen.