1. Broecker, W. S. & van Donk, J. ( 1970 ) Rev. Geophys. Space Phys. 8 , 169–197 .

2. Imbrie, J. & Imbrie, K.P. ( 1979 ) Ice Ages, Solving the Mystery ( Harvard Univ. Press , Cambridge, MA ).

3. Milankovitch, M. ( 1941 ) Canon of Insolation and the Ice-Age Problem ( Royal Serbian Academy , Belgrade, Yugoslavia ).

4. Milankovitch, M. ( 1920 ) Théorie Mathématique des Phénomènes Produits par la Radiation Solaire ( Gauthier-Villars , Paris ).

5. Quinn, T. R. , Tremaine, S. & Duncan, M. ( 1991 ) Astron. J. 101 , 2287–2305 .

6. Imbrie, J. , Berger, A. , Boyle, E. , Clemens, S. , Duffy, A. , Howard, W. , Kukla, G. , Kutzbach, J. , Martinson, D. , McIntyre, A. , Mir, A. , Molfino, B. , Morley, J. , Peterson, L. , Pisias, N. , Prell, W. , Raymo, M. , Shackleton, N. & Toggweiller, J. ( 1993 ) Paleoceanography 8 , 699–735 .

7. Ruddiman, W.F. , Raymo, M. & McIntyre, A. ( 1986 ) Earth Planet. Sci. Lett. 80 , 117–129 .

8. Winograd, I. J. , Coplen, T. B. , Landwehr, J. M. , Riggs, A. C. , Ludwig, K. R. , Szabo, B. J. , Kolesar, P. T. & Revesz, K. M. ( 1992 ) Science 258 , 255–260 .

9. Imbrie, J. , Mix, A. C. & Martinson, D. G. ( 1993 ) Nature (London) 363 , 531–533 .

10. Winograd, I. J. & Landwehr, J. M. ( 1993 ) U.S. Geological Survey Open-File ( U.S. Geological Survey , Reston, VA ), Rep. USGS 93–357 .

11. Ludwig, K. R. , Simmons, K. R. , Winograd, I. J. , Szabo, B. J. & Riggs, A. C. ( 1993 ) Science 259 , 1626–1627 .

12. Emiliani, C. ( 1993 ) Nature (London) 364 , 583–584 .

13. Landwehr, J. M. , Winograd, I. J. & Coplen, T. B. ( 1994 ) Nature (London) 368 , 594 .

14. Muller, R. A. & MacDonald, G. J. ( 1995 ) Nature (London) 377 , 107–108 .

15. Ruddiman, W. F. , Raymo, M. E. , Martijnson, D. G. , Clement, B. M. & Backman, J. ( 1989 ) Plaeoceanography 4 , 353–412 .

16. Imbrie, J. , Hays, J. , Martinson, D. , McIntyre, A. , Mix, A. , Morley, J. , Pisias, N. , Prell, W. & Shackleton, N. ( 1984 ) in Milankovitch and Climate Part 1 , eds. Berger, A. , Imbrie, J. & Shackleton, N. ( Riedel, Dordrecht , The Netherlands ), pp. 269–305 .

17. Lomb, N. ( 1976 ) Astrophys. Space Sci. 39 , 447–462 .

18. MacDonald, G. J. ( 1989 ) Rev. Geophys. 27 , 449–469 .

19. Berger, W. H. , Yasuda, M. K. , Bickert, T. , Wefer, G. & Takayama, T. ( 1994 ) Geology 22 , 463–467 .

20. Blackman, R. B. & Tukey, J. W. ( 1958 ) The Measurement of Power Spectra ( Dover , New York ).

21. Imbrie, J. & Imbrie, J. Z. ( 1980 ) Science 207 , 943–952 .

22. Berger, A. & Loutre, M. ( 1991 ) Earth Planet. Sci. Lett. 111 , 369–382 .

23. Neeman, B. U. ( 1993 ) Orbital Tuning of Paleoclimatic Records: A Reassessment ( Lawrence Berkeley National Laboratory , Berkeley, CA ), Rep. LBNL-39572 .

24. Muller, R. A. ( 1994 ) Glacial Cycles and Extraterrestrial Accretion ( Lawrence Berkeley Laboratory , Berkeley, CA ), Rep. LBL-35665 .

25. Muller, R. A. & MacDonald, G. J. ( 1994 ) Glacial Cycles: Orbital Mutation Dominated for the Last 900,000 Years ( Lawrence Berkeley Laboratory , Berkeley, CA ), Rep. LBL-35667 .

26. MacDonald, G. J. & Muller, R. A. ( 1994 ) Bispectral Fingerprint Identifies 100 ky Climate Cycle: Orbital Inclination ( Lawrence Berkeley Laboratory , Berkeley, CA ), Rep. LBL-36214 .

27. Muller, R. A. & MacDonald, G. J. ( 1997 ) Geology 25 , 3–6 .

28. Hoyle, F. & Lyttleton, R. A. ( 1939 ) Proc. Cambridge Philos. Soc. 35 , 405–415 .

29. McCrea, W. H. ( 1975 ) Nature (London) 255 , 607–609 .

30. Clube, S. ( 1987 ) Philos. Trans. R. Soc. London 323 , 421–436 .

31. Hoyle, F. & Wickramasinghe, N. C. ( 1991 ) Nature (London) 350 , 467 .

32. Manley, G. ( 1953 ) Nature (London) 173 , 1206–1208 .

33. Kondratyev, K. Y. ( 1988 ) Climate Shocks: Natural and Anthropogenic ( Wiley , New York ).

34. Kyte, F. T. & Wasson, J. T. ( 1986 ) Science 232 , 1225–1229 .

35. Thomas, G. E. ( 1991 ) Rev. Geophys. 29 , 553–575 .

36. Foyle, B. & Haurwitz, B. ( 1966 ) Space Sci. Rev. 6 , 279–340 .

37. Thomas, G. E. & Olivero, J. J. ( 1989 ) J. Geophys. Res. 94 , 14673–14681 .

38. Whipple, F. L. & Hawkins, G. S. ( 1956 ) J. Meteorol. 13 , 236–240 .

39. Farley, K. & Patterson, D. B. ( 1995 ) Nature (London) 378 , 600–603 .

40. Farley, K. ( 1995 ) Nature (London) 378 , 153–156 .

Contents (R1-R4)

Climate change and carbon dioxide: An introduction (1-2)

Tribute to Roger Revelle and his contribution to studies of carbon dioxide and climate change (3-7)

Equilibration of the terrestrial water, nitrogen, and carbon cycles (8-11)

Potential responses of soil organic carbon to global environmental change (12-19)

Global air-sea flux of CO2: An estimate based on measurements of sea-air pCO2 differences (20-27)

Characteristics of the deep ocean carbon system during the past 150,000 years: CO2 distributions, deep water flow patterns, and abrupt climate change (28-35)

Direct observation of the oceanic CO2 increase revisited (36-41)

The observed global warming record: What does it tell us? (42-48)

Possible forcing of global temperature by the oceanic tides (49-56)

Spectrum of 100-kyr glacial cycle: Orbital inclination, not eccentricity (57-62)

Can increasing carbon dioxide cause climate change? (63-70)

Gases in ice cores (71-77)

Tree rings, carbon dioxide, and climatic change (78-81)

Geochemistry of corals: Proxies of past ocean chemistry, ocean circulation, and climate (82-89)

A long marine history of carbon cycle modulation by orgital-climatic changes (90-97)

Dependence of global temperatures on atmospheric CO2 and solar irradiance (98-107)