A | Global warming | I | Greenhouse effect |
B | Carbon dioxide | II | Threat to aquatic life |
C | Acid rain | III | Cold planet |
D | Nuclear winter | IV | Rise in sea level |
A | Global warming | IV | Rise in sea level |
B | Carbon dioxide | I | Greenhouse effect |
C | Acid rain | II | Threat to aquatic life |
D | Nuclear winter | III | Cold planet |