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Abstract

Solar evolution implies, for contemporary albedos and atmospheric composition, global mean temperatures below the freezing point of seawater less than 2.3 aeons ago, contrary to geologic and paleontological evidence. Ammonia mixing ratios of the order of a few parts per million in the middle Precambrian atmosphere resolve this and other problems. Possible temperature evolutionary tracks for Earth and Mars are described. A runaway greenhouse effect will occur on Earth about 4.5 aeons from now, when clement conditions will prevail on Mars.

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References

ABELSON, P.H., CHEMICAL EVENTS ON PRIMITIVE EARTH, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 55: 1365 (1966).
Bada, J., Proceedings of the 5th Conference on the Origins of Life (1971).
BADA, J.L., AMMONIUM ION CONCENTRATION IN PRIMITIVE OCEAN, SCIENCE 159: 423 (1968).
BAHCALL, J.N., SOLAR MODELS AND NEUTRINO FLUXES, ASTROPHYSICAL JOURNAL 153: 113 (1968).
Barth, C., Icarus 17: 457 (1972).
BERKNER, L.V., ON ORIGIN AND RISE OF OXYGEN CONCENTRATION IN EARTHS ATMOSPHERE, JOURNAL OF THE ATMOSPHERIC SCIENCES 22: 225 (1965).
BUDYKO, M.I., JOURNAL OF APPLIED METEOROLOGY 9: 310 (1970).
CANNON, R.T., AGE OF TRANSITION IN PRE-CAMBRIAN ATMOSPHERE, NATURE 205: 586 (1965).
CHAPMAN, C.R., AN ANALYSIS OF MARINER-4 CRATERING STATISTICS, ASTRONOMICAL JOURNAL 74: 1039 (1969).
DERRY, D.R., BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 70: 1587 (1959).
DOLLFUS, A, PRIMITIVE ATMOSPHERE OF PLANET MARS ACCORDING TO PHOTOGRAPHS TRANSMITTED BY INTERPLANETARY PROBES MARINER-6 AND MARINER-7, COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE B 270: 424 (1970).
DONN, W.L., BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 76: 287 (1965).
EZER, D, CANADIAN JOURNAL OF PHYSICS 43: 1497 (1965).
GLOUD, P, SCIENCE 160: 729 (1968).
Goody, R. M., Atmospheric Radiation (1964).
HARTMANN, W.K., MARTIAN CRATERING .3. THEORY OF CRATER OBLITERATION, ICARUS 15: 410 (1971).
HASELGROVE, C.B., MAIN-SEQUENCE STARS, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 119: 112 (1959).
HOFFMAN, P.F., GEOLOGICAL SURVEY OF CANADA PAPER 68-42 (1969).
Holland, H. D., in preparation.
HOROWITZ, N.H., ON THE EVOLUTION OF BIOCHEMICAL SYNTHESES, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 31: 153 (1945).
HOYLE, F, STELLAR POPULATIONS: 223 (1958).
HUTCHINSON, G.E., EARTH PLANET: 371 (1954).
IBEN, I, CL37 SOLAR NEUTRINO EXPERIMENT AND SOLAR HELIUM ABUNDANCE, ANNALS OF PHYSICS 54: 164 (1969).
IBEN, I, STELLAR EVOLUTION: 237 (1966).
INGERSOLL, A.P., RUNAWAY GREENHOUSE - A HISTORY OF WATER ON VENUS, JOURNAL OF THE ATMOSPHERIC SCIENCES 26: 1191 (1969).
JOHNSON, F.S., GLOBAL EFFECTS ENVIR: 4 (1970).
KONDRATYEV, K.Y., RADIATION ATMOSPHERE (1969).
LEDERBERG, J, MICROENVIRONMENTS FOR LIFE ON MARS, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 48: 1473 (1962).
LEHNINGER, A.L., BIOCHEMISTRY: 560 (1970).
LIPPINCOTT, E.R., THERMODYNAMIC EQUILIBRIA IN PLANETARY ATMOSPHERES, ASTROPHYSICAL JOURNAL 147: 753 (1967).
London, J., Final Report, contract AF 19(122)-165 (1957).
Lyon, R. J. P., NASA Contractor Report CR-100 (1964).
MANABE, S, SLOBAL EFFECTS ENVIR: 25 (1970).
MCGOVERN, W.E., PRIMITIVE EARTH - THERMAL MODELS OF UPPER ATMOSPHERE FOR A METHANE-DOMINATED ENVIRONMENT, JOURNAL OF THE ATMOSPHERIC SCIENCES 26: 623 (1969).
MURRAY, B.C., SURFACE OF MARS .1. CRATERED TERRAINS, JOURNAL OF GEOPHYSICAL RESEARCH 76: 313 (1971).
OLSON, J.M., EVOLUTION OF PHOTOSYNTHESIS, SCIENCE 168: 438 (1970).
PERRY, E.C., SULFUR ISOTOPES IN SWAZILAND SYSTEM BARITES AND EVOLUTION OF EARTHS ATMOSPHERE, SCIENCE 171: 1015 (1971).
POLLACK, J.B., NONGREY CALCULATION OF RUNAWAY GREENHOUSE - IMPLICATIONS FOR VENUS PAST AND PRESENT, ICARUS 14: 295 (1971).
RAMDOHR, P, ABH DEUT AKAD WI CGB 3: 35 (1958).
RAMSAY, J.G., TRANSACTIONS OF THE GEOLOGICAL SOCIETY OF SOUTH AFRICA 66: 353 (1963).
RASOOL, S.I., RUNAWAY GREENHOUSE AND ACCUMULATION OF CO2 IN VENUS ATMOSPHERE, NATURE 226: 1037 (1970).
RUTTEN, M.G., GEOLOGICAL ASPECTS O (1962).
SAGAN, C, ENCYCLOPAEDIA BRITAN (1970).
SAGAN, C, MICROWAVE SPECTRUM OF MARS - ANALYSIS, ICARUS 14: 222 (1971).
SAGAN, C, LONG WINTER MODEL OF MARTIAN BIOLOGY - SPECULATION, ICARUS 15: 511 (1971).
SAGAN, C, INT DICTIONARY GEOPH: 97 (1967).
SAGAN, C, INTELLIGENT LIFE UNI: 222 (1966).
SAGAN, C, ON ORIGIN AND PLANETARY DISTRIBUTION OF LIFE, RADIATION RESEARCH 15: 174 (1961).
Sagan, C., Jet Propulsion Laboratory, Pasadena Technical Report TR 32-34 (1960).
Sagan, C., Cornell Center for Radiophysics and Space Research Report 460 (1971).
SASAMORI, T, SPACE RESEARCH 11 (1971).
Schopf, J. W., Biological Reviews, in press.
SCHOPF, J.W., ALGA-LIKE FOSSILS FROM EARLY PRECAMBRIAN OF SOUTH AFRICA, SCIENCE 156: 508 (1967).
SCHWARZSCHILD, M, STELLAR POPULATIONS: 207 (1958).
SCHWARZSCHILD, M, INHOMOGENEOUS STELLAR MODELS .5. A SOLAR MODEL WITH CONVECTIVE ENVELOPE AND INHOMOGENEOUS INTERIOR, ASTROPHYSICAL JOURNAL 125: 233 (1957).
SELLERS, W.D., JOURNAL OF APPLIED METEOROLOGY 8: 392 (1969).
Stanier, R. Y., The Microbial World 2 (1963).
Urey, H. C., The Planets (1952).
VANVALEN, L, HISTORY AND STABILITY OF ATMOSPHERIC OXYGEN, SCIENCE 171: 439 (1971).
Vishniac, W., Biology and the Exploration of Mars (1966).
VONDERHAAR, T.H., MEASUREMENTS OF EARTHS RADIATION BUDGET FROM SATELLITES DURING A 5-YEAR PERIOD .1. EXTENDED TIME AND SPACE MEANS, JOURNAL OF THE ATMOSPHERIC SCIENCES 28: 305 (1971).
WALTER, M.R., STROMATOLITES USED TO DETERMINE TIME OF NEAREST APPROACH OF EARTH AND MOON, SCIENCE 170: 1331 (1970).

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Science
Volume 177 | Issue 4043
7 July 1972

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Published in print: 7 July 1972

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Carl Sagan
Laboratory for Planetary Studies, Cornell University, Ithaca, New York
George Mullen
Laboratory for Planetary Studies, Cornell University, Ithaca, New York

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