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Property Organism Value Units ID Details
Number of People Who Have Ever Lived on Earth Human Homo sapiens 1.08e+11 Humans 111241 Population Reference...
Total carbon of prokaryotes on earth as percent of carbon found in plants prokaryote ~60 to 100 % 108510 William B. Whitman,*†...
Number of cells of bacteria and archaea estimated to inhabit Earth Biosphere ~10^30 cells 113931 Locey KJ, Lennon JT....
Fraction of Earth’s ice-free land area covered by alfisols (a soil type) Biosphere 13.5 % 113323 Hicks Pries CE, Castanha C...
Ratio of ozone to oxygen in the stratosphere of present-day Earth Biosphere ~5×10^-5 unitless 115037 Kihara S, Hartzler DA...
Fraction of number of individual animals that once shared the Earth with humans that are extinct Biosphere ≤50 % of individual animals 117268 Ceballos G, Ehrlich PR...
Fraction of oxygen consumption by living organisms on earth by cytochrome oxidase Biosphere 90 % 103301 Wong-Riley MT. Cytochrome...
Number of animal species catalogued in a central database as of 2011 and number of predicted species on Earth Eukaryotes Catalogued ~950,000 Predicted ~7,770,000 Table - link species 109318 Mora C, Tittensor DP...
Number of archaea species catalogued in a central database as of 2011 and number of predicted species on Earth Archaea Catalogued 502 Predicted 455 Table - link species 109322 Mora C, Tittensor DP...
Number of plant species catalogued in a central database as of 2011 and number of predicted species on Earth Plants Catalogued ~216,000 Predicted ~298,000 Table - link Species 109319 Mora C, Tittensor DP...
Number of fungi species catalogued in a central database as of 2011 and number of predicted species on Earth Fungus Catalogued ~43,000 Predicted 611,000 Table - link Species 109320 Mora C, Tittensor DP...
Number of protozoa species catalogued in a central database as of 2011 and number of predicted species on Earth Protists Catalogued ~8,100 Predicted ~36,400 Table - link Species 109321 Mora C, Tittensor DP...
Fraction of all microbial cells that inhabit the deep biosphere (accounting for a third to half of all living biomass carbon on Earth) Biosphere 94 % of all microbial cells 115328 Braun S et al., Size...
Span of Geozoic (since life first appeared till present day) Biosphere ~3,600 Mya 113312 Smith et al., Body size...
Present average solar radiation Biosphere 340 W/m^2 116099 Duursma EK, Boisson MPRM...
Fraction of all the water on the Earth that is in the oceans (the rest is held as freshwater in glaciers and icecaps, groundwater, lakes, soil, the atmosphere, and within life) Biosphere ~97 % 115097 Pidwirny, M. (2006)....
Beginning of photosynthesis using chlorophyll pigments Biosphere ~1.8 Billion years ago 116087 Duursma EK, Boisson MPRM...
Beginning of atmospheric oxygen production Biosphere ~3.2 Billion years ago 116068 Duursma EK, Boisson MPRM...
Amount of oxygen in biosphere (for mass of total oxygen see 'Comments' section) Biosphere Net total amount 5.63×10^20: free oxygen in the atmosphere 3.75×10^19: dissolved oxygen in the oceans 3.1×10^17: (the remainder stored in a large number of oxidized terrestrial and oceanic compounds) mol 116069 Duursma EK, Boisson MPRM...
Range of atmospheric oxygen in the past 600 million years Biosphere 7 - 30 O2 volume % 116072 Duursma EK, Boisson MPRM...