ocr: Oveniew of the cause-etect that the concentration of carbon situaton: increased Some scientists argue CO2 wAl nave d dioxide in the atmosphere will have doubled by the year 2020 atmosphenc number of ettects. and will bring about disastrous climatic changes. If they are right, we of can about expect 3° to an 5° C, increase with in an mean increase qlobal of 12° C at ETect 7 cemperature the poles. There will also be widespread changes in local Effect2 weather patterns, with record high temperatures and droughts like those of the 1930s becoming commonplace. Increased Effedct. 3 tropical storm act ...
