During the recent
years, the term sustainability has been used quite broadly. As a biologist, I
seldom think of the role of people within a society. My definition of
sustainability is, therefore, linked to resilience of a group. This group may refer to a population, a single
species, a community, a region, and others. But before, I would like to
focus on something else (still related to this subject).
According to the Stockholm Resilience Centre (SRC), there are nine planetary boundaries. These refer to border definitions of natural ecosystems, including humans (yes, we are supposedly a part of nature too). For the sake of misunderstandings, I decided to summarized them in a single sentence each, so I can refer to them in the future. I give really short descriptions, with a non-scientific language, just to keep it simple. I apologize to scientists who read this.
According to the Stockholm Resilience Centre (SRC), there are nine planetary boundaries. These refer to border definitions of natural ecosystems, including humans (yes, we are supposedly a part of nature too). For the sake of misunderstandings, I decided to summarized them in a single sentence each, so I can refer to them in the future. I give really short descriptions, with a non-scientific language, just to keep it simple. I apologize to scientists who read this.
1) Stratospheric ozone layer - Filters out ultraviolet radiation from the sun that could otherwise increase incidence of skin cancer in humans, and damage terrestrial and marine biological systems.
2) Biodiversity - Number of species
within a specific region that, when reaches 0 (zero in that specific region) for a specific species, this species is then extinct in that
region.
3)
Chemicals dispersion - Emissions
of persistent toxic compounds that may reduce fertility and
permanent genetic damage.
4) Climate Change – Alterations in temperature, humidity, atmospheric
pressure, wind, precipitation, among many
others, that have diverse effects within the Earth system.
5) Ocean
acidification – The
oceans absorb around a quarter of the CO2 produced, rising its acidity, and reducing carbonate ions, which is essential for shell and skeleton formation in organisms
such as corals, and some shellfish and plankton species.
6) Freshwater consumption and the global hydrological cycle - This cycle, as
a key to keep the planet within the climate boundary, is, however, strongly affected by climate change, and is dramatically decreased by human consumption.
7) Land system change – The transformation of forests, wetlands, and
other vegetation types in agricultural land reduces biodiversity, affects water
flows, and biogeochemical cycles (such as the one of carbon).
8) Nitrogen and phosphorus inputs to the biosphere and oceans
- Human activities
convert huge amounts of N2
from the atmosphere into reactive forms, which pollute waterways and coastal
zones, are emitted back to the atmosphere in various forms, or accumulate in the
terrestrial biosphere.
9) Atmospheric
aerosol loading - Without aerosol
particles in the atmosphere, we would not have clouds, by reflecting incoming sunlight back to space, which may keep the
planet at “living temperatures”.
I hope it is
understandable now.
Sources:
Rockström, J., W. Steffen, K. Noone, Å. Persson, F. S. Chapin, III, E. Lambin, T. M. Lenton, M. Scheffer, C. Folke, H. Schellnhuber, B. Nykvist, C. A. De Wit, T. Hughes, S. van der Leeuw, H. Rodhe, S. Sörlin, P. K. Snyder, R. Costanza, U. Svedin, M. Falkenmark, L. Karlberg, R. W. Corell, V. J. Fabry, J. Hansen, B.
Walker, D. Liverman, K. Richardson, P. Crutzen, and J. Foley. 2009.
Planetary boundaries:exploring the safe operating
space for humanity. Ecology and Society 14(2): 32. PDF
I did it! Ok, not everything, but I am trying. I have achieved quite a lot for such a short
time.
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