Share This Author
Target atmospheric CO2: Where should humanity aim?
Paleoclimate data show that climate sensitivity is ~3 deg-C for doubled CO2, including only fast feedback processes. Equilibrium sensitivity, including slower surface albedo feedbacks, is ~6 deg-C…
Convergent Cenozoic CO2 history
Reconstructions of atmospheric carbon dioxide concentrations over the past 65 million years are heading towards consensus. It is time for systematic testing of the proxies, against measurements and…
Maximum leaf conductance driven by CO2 effects on stomatal size and density over geologic time
- P. Franks, D. Beerling
- Environmental ScienceProceedings of the National Academy of Sciences
- 23 June 2009
It is shown that high densities of small stomata are the only way to attain the highest gcmax values required to counter CO2“starvation” at low atmospheric CO2 concentrations, and may represent a mechanism linking CO2 and the increasing gas-exchange capacity of land plants over geologic time.
The interdependence of mechanisms underlying climate-driven vegetation mortality.
A humid climate state during the Palaeocene/Eocene thermal maximum
- G. Bowen, D. Beerling, P. Koch, J. Zachos, T. Quattlebaum
- Environmental Science, GeographyNature
- 25 November 2004
The authors' results provide evidence for a previously unrecognized discrete shift in the state of the climate system during the PETM, characterized by large increases in mid-latitude tropospheric humidity and enhanced cycling of carbon through terrestrial ecosystems.
Present state of global wetland extent and wetland methane modelling: conclusions from a model inter-comparison project (WETCHIMP)
Abstract. Global wetlands are believed to be climate sensitive, and are the largest natural emitters of methane (CH4). Increased wetland CH4 emissions could act as a positive feedback to future…
Paleobotanical evidence for near present-day levels of atmospheric Co2 during part of the tertiary.
This reconstruction indicates that CO(2) remained between 300 and 450 parts per million by volume for these intervals with the exception of a single high estimate near the Paleocene/Eocene boundary, and suggests that factors in addition to CO( 2) are required to explain these past intervals of global warmth.
Plasticity in maximum stomatal conductance constrained by negative correlation between stomatal size and density: an analysis using Eucalyptus globulus.
It is shown that a negative correlation between S and D offers several advantages, including plasticity in gwmax and gcmax with minimal change in epidermal area allocation to stomata, and higher maximum stomatal conductance characterized by smaller S and higher D.
One thousand plant transcriptomes and the phylogenomics of green plants
- James H. Michael S. Eric J. Michael K. Matthew A. Sean W Leebens-Mack Barker Carpenter Deyholos Gitzendanne, J. Leebens-Mack, G. Wong
- Biology, Environmental ScienceNature
- 7 October 2019
It is found that large expansions of gene families preceded the origins of green plants, land plants and vascular plants, whereas whole-genome duplications are inferred to have occurred repeatedly throughout the evolution of flowering plants and ferns.
Assessing “Dangerous Climate Change”: Required Reduction of Carbon Emissions to Protect Young People, Future Generations and Nature
Climate impacts of global warming is assessed using ongoing observations and paleoclimate data and simple representations of the global carbon cycle and temperature to define emission reductions needed to stabilize climate and avoid potentially disastrous impacts on today’s young people, future generations, and nature.