Masalah yang Dapat Memusnahkan Bumi

https://environment-indonesia.com/articles/afionisk-alat-filterisasi-dan-konversi-asap-pabrik/

https://www.rumah.com/panduan-properti/asap-pabrik-55893

http://lipi.go.id/berita/single/Siswa-SMAN-3-Semarang-Ubah-Asap-Jadi-Oksigen/7829

https://iee.psu.edu/news/blog/how-many-trees-are-needed-take-carbon-dioxide-i-release-every-day#:~:text=So%20how%20many%20trees%20are,the%20food%20that%20we%20eat.

https://biofriendlyplanet.com/green-alternatives/5-health-and-environmental-benefits-of-riding-your-bike/#:~:text=Bike%20riding%2C%20on%20the%20other,greenhouse%20gas%20emissions%20each%20year.

https://gaya.tempo.co/read/1559667/deretan-manfaat-air-purifier-dengan-hepa-filter/full&view=ok