Votes and proceedings of the General Assembly of the state of New-Jersey . perature increase due toC02 in Fig. I is calculated on the basis ofthe following assumptions: (i) 50 percent ofthe C02 generated by the burning of chem-ical fuels has in the past and will in thenear future remain in the atmosphere; (ii)the United Nations fuel consumption esti-mates are used to I960 (//); between 1960and 1975 a growth rate of percent peryear is used, and from 1975 on a 3 percentgrowth rate is predicted; (iii) for each 10percent increase in the atmospheric C02content the mean global temperature in-cre
Votes and proceedings of the General Assembly of the state of New-Jersey . perature increase due toC02 in Fig. I is calculated on the basis ofthe following assumptions: (i) 50 percent ofthe C02 generated by the burning of chem-ical fuels has in the past and will in thenear future remain in the atmosphere; (ii)the United Nations fuel consumption esti-mates are used to I960 (//); between 1960and 1975 a growth rate of percent peryear is used, and from 1975 on a 3 percentgrowth rate is predicted; (iii) for each 10percent increase in the atmospheric C02content the mean global temperature in-creases by °C. These calculations aresummarized in Table I. Meteorological records of the meanglobal temperature are adequate only overthe last century. The mean global tempera-ture (successive 5-year means) obtainedfrom these records by Mitchell (12) is giv-en in Fig. I. From this record alone littlecan be said about the causes of climaticfluctuations. It is too short and may be in-fluenced by pollution. Obtaining compar-able information from historic and natural 2000. -30 -29 -28 <5180 (per mil) Fig. 2. Difference (per mil) between the ilO/*0ratio in decade composites of Greenland icefrom the Camp Century site and mean oceanwater as obtained by Dansgaard and his co-workers (/). A decrease of 1 per mil in the Ocontent corresponds to a °C drop in airtemperature. The curve on the left is the simula-tion of the isotope curve obtained by combiningsinusoidal curves with periods of 80 and 180years. records for previous centuries has provedvery difficult. There is no simple relationbetween the indices used and the tempera-ture, and regional noise tends to mask theglobal picture. In my estimation the onlyexisting record which may give a picture ofthe natural fluctuations in global tempera-ture over the last 1000 years is that fromthe ice core taken at Camp Century innorthwestern Greenland. The air tempera-ture over this site is being recorded interms of the ratio of l40 to ,40
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