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Biotic enhancement of weathering and the habitability of Earth
AN important question in the Earth sciences is the role of the biota in the chemical weathering of silicate rocks, which affects atmospheric CO2 and therefore climate1-10. No comprehensive study of…
Life, Temperature, and the Earth: The Self-Organizing Biosphere
- D. Schwartzman
The idea that living things and the atmosphere, oceans, and soils comprise an interactive, self-regulating system-the Gaia concept-was first proposed nearly thirty years ago. Since then researchers…
Cyanobacterial emergence at 2.8 gya and greenhouse feedbacks.
A greenhouse transition timescale on the order of 50-100 million years is consistent with results from modeling the carbonate-silicate cycle, and is an alternative hypothesis to proposals of a tectonic driver for this apparent greenhouse transition.
The hyperthermophilic origin of life revisited.
The case for hot biogenesis and the last common ancestor has gotten stronger and some doubts remain, but the case for hyperthermophilic scenario is still strong.
Weathering rates of bedrock by lichens: a mini watershed study
Life’s Critical Role in the Long-term Carbon Cycle: the Biotic Enhancement of Weathering
- D. Schwartzman
- Environmental Science
- 10 June 2017
The biotic enhancement of weathering (BEW) has important implications for the long-term carbon cycle, in particular as a driver of climatic cooling. The BEW factor is defined as how much faster the…
Did surface temperatures constrain microbial evolution?
It is proposed here that two major evolutionary developments--the emergence of cyanobacteria and aerobic eukaryotes--can be used to determine surface temperature in the Precambrian, and that only subsequent cooling mediated by higher plants and then angiosperms permitted what may possibly be the earth's first glaciation in the late Cenozoic.
Biotic enhancement of weathering and surface temperatures on earth since the origin of life
Homochirality as the signature of life: the SETH Cigar.