Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints

Neoarchean paleoweathering of tonalite and metabasalt: Implications for reconstructions of 2.69Ga early terrestrial ecosystems and paleoatmospheric chemistry

(2011) Steven G. Driese et al.   PRECAMBRIAN RESEARCH

Oxygen and hydrogen isotope evidence for a temperate climate 3.42 billion years ago

(2009) M. T. Hren et al.   NATURE

Nitrogen-enhanced greenhouse warming on early Earth

(2009) Colin Goldblatt et al.   Nature Geoscience

Isotopic Evidence for an Aerobic Nitrogen Cycle in the Latest Archean

(2009) J. Garvin et al.   SCIENCE

A Revised, Hazy Methane Greenhouse for the Archean Earth

(2008) Jacob D. Haqq-Misra et al.   ASTROBIOLOGY

Organic haze, glaciations and multiple sulfur isotopes in the Mid-Archean Era

(2008) Shawn D. Domagal-Goldman et al.   EARTH AND PLANETARY SCIENCE LETTERS

An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics

(2008) James C. Zachos et al.   NATURE