Has the Earth’s sixth mass extinction already arrived?
Differences between fossil and modern data and the addition of recently available palaeontological information influence understanding of the current extinction crisis, and results confirm that current extinction rates are higher than would be expected from the fossil record.
6. Mammalian Biochronology of the Arikareean Through Hemphillian Interval (Late Oligocene Through Early Pliocene Epochs)
Assessing the Causes of Late Pleistocene Extinctions on the Continents
- A. Barnosky, P. Koch, Robert S. Feranec, S. Wing, Alan B. Shabel
- Environmental Science, GeographyScience
- 1 October 2004
Evidence now supports the idea that humans contributed to extinction on some continents, but human hunting was not solely responsible for the pattern of extinction everywhere, and suggests that the intersection of human impacts with pronounced climatic change drove the precise timing and geography of extinction in the Northern Hemisphere.
Trajectories of the Earth System in the Anthropocene
- W. Steffen, J. Rockström, H. Schellnhuber
- Environmental ScienceProceedings of the National Academy of Sciences
- 6 August 2018
We explore the risk that self-reinforcing feedbacks could push the Earth System toward a planetary threshold that, if crossed, could prevent stabilization of the climate at intermediate temperature…
Accelerated modern human–induced species losses: Entering the sixth mass extinction
- G. Ceballos, P. Ehrlich, A. Barnosky, Andrés García, R. Pringle, T. Palmer
- Environmental Science, GeographyScience Advances
- 1 June 2015
Estimates of extinction rates reveal an exceptionally rapid loss of biodiversity over the last few centuries, indicating that a sixth mass extinction is already under way and a window of opportunity is rapidly closing.
Late Quaternary Extinctions: State of the Debate
Results from recent studies suggest that humans precipitated extinction in many parts of the globe through combined direct (hunting) and perhaps indirect (competition, habitat alteration) impacts, but that the timing and geography of extinction might have been different and the worldwide magnitude less, had not climatic change coincided with human impacts in many places.
The Anthropocene is functionally and stratigraphically distinct from the Holocene
C climatic, biological, and geochemical signatures of human activity in sediments and ice cores, Combined with deposits of new materials and radionuclides, as well as human-caused modification of sedimentary processes, the Anthropocene stands alone stratigraphically as a new epoch beginning sometime in the mid–20th century.
7. The Blancan, Irvingtonian, and Rancholabrean Mammal Ages
Approaching a state shift in Earth’s biosphere
Evidence that the global ecosystem as a whole is approaching a planetary-scale critical transition as a result of human influence is reviewed, highlighting the need to improve biological forecasting by detecting early warning signs of critical transitions.