While high CO ₂ levels have been present in Earth's atmosphere before (e.g., during the Cambrian and Archaean) without initiating either the moist or
runaway greenhouse state, never has the rate of warming been annual in scale as today.
If our climate was dominated by positive feedbacks, it would have saturated to
a runaway greenhouse state long ago.
We show that planets near the inner edge of the habitable zone should generally first enter a moist greenhouse state, although planets around the coolest stars we analyzed should directly transition into
a runaway greenhouse state instead.
«[T] his analysis would predict that the models will swing ever more wildly between snowball and
runaway greenhouse states.»
Not exact matches
The science says that industrial
states like New York must get to 100 % clean energy and zero net
greenhouse gas emissions by 2030 if the planet is to avert
runaway global warming and climate catastrophe,» Hawkins said.
[Response: What happened in the Eocene wouldn't count as a
runaway in the sense of the
runaway greenhouse that brought Venus to its present toasty
state.
«
Runaway greenhouse theories contradict energy balance equations,» Miskolczi
states.
Venus succumbed early to a «
runaway water vapor
greenhouse,» in which the increased water vapor content arising from increased temperature reached an end
state with much of the ocean evaporated into the atmosphere.
The
stated purpose of geoengineering and solar radiation management (SRM) operations is to slow down or temporarily mitigate an unfolding
runaway greenhouse scenario on Earth (potentially triggering «Venus Syndrome»).
The
runaway greenhouse effect has several meanings ranging from, at the low end, global warming sufficient to induce out - of - control amplifying feedbacks, such as ice sheet disintegration and melting of methane hydrates, to, at the high end, a Venus - like hothouse with crustal carbon baked into the atmosphere and a surface temperature of several hundred degrees, a climate
state from which there is no escape.
Ingersoll [105] discussed the role of water vapours in the «
runaway greenhouse effect» that caused the surface of Venus to eventually become so hot that carbon was «baked» from the planet's crust, creating a hothouse climate with almost 100 bars of CO2 in the air and a surface temperature of about 450 °C, a stable
state from which there is no escape.
I'm pretty sure the reason is because if you strip the ocean out of the coupled models the earth would be completely covered in snow in a matter of weeks and would stay the way for millions of years while CO2 built up in the atmosphere from volcanic discharges until it was as thick as the Venusion atmosphere and then it would be a
runaway greenhouse same as Venus with the final stable
state hot enough to melt lead on the surface.