Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proposal for climate stability on H2-greenhouse planets   A terrestrial planet in an orbit far outside of the standard habitable zone
could maintain surface liquid water as a result of H2-H2 collision-induced
absorption by a thick H2 atmosphere. Without a stabilizing climate feedback,
however, habitability would be accidental and likely brief. In this letter I
propose stabilizing climate feedbacks for such a planet that require only that
biological functions have an optimal temperature and operate less efficiently
at other temperatures. For example, on a planet with a net source of H2 from
its interior, H2-consuming life (such as methanogens) could establish a stable
climate. If a positive perturbation is added to the equilibrium temperature, H2
consumption by life will increase (cooling the planet) until the equilibrium
climate is reestablished. The potential existence of such feedbacks makes
H2-warmed planets more attractive astrobiological targets.

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The categories of this paper are: eess
18
The categories of this paper are: econ
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga