Global problems. Ozone hole. Greenhouse effect. The melting of glaciers. Reducing biodiversity. https:// docs.google.com/document/d/186DQ31JvZ7OqO7rQ10YxJhrH4oy06M_iwA4dcaN8ZkI/preview?pli=1 Created by: Ondřej Voplakal Ondřej Řezník.
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