arabera Mark Heng 13 years ago
1393
Honelako gehiago
Kathleen Terhune‑k egina
Vitalik Buterin‑k egina
Natasha Ameilda‑k egina
LeeSongKwokLaw Group‑k egina
Global warming
Depletion of ozome layer
Acid rain
Human Waste
Harmful Chemicals
Littering