[1] 다 같은 철이 아니다?
https://www.youtube.com/watch?v=OaHq74WP8Nk
[2] 비철금속
https://www.youtube.com/watch?v=Pyt30bIwQ6A
[3] 플라스틱 종류(분리수거)
https://www.youtube.com/watch?v=O5WGsGwQpMw
[4] 집성재
https://www.youtube.com/shorts/xQ7B_NFyL58
[5] 합판
https://www.youtube.com/shorts/CffgujOXv8A
[6] 파티클보드
https://www.youtube.com/watch?v=E4Hx-E0Y57o
[7] mdf
https://www.youtube.com/shorts/nsVmQjzxuiQ
[8] 플라스틱의 문제
https://www.youtube.com/watch?v=zOFXPjdkQzY
[9] 쓰레기 식민지
https://www.youtube.com/watch?v=8GsH5b1G5Ew
