The Tipping Point



Since the last unit was about tipping points, I decided to read articles on internet that could tell me more about tipping points in the world. After reading for a couple of minutes, I found this interesting article about nature tipping points. After reading this article, I hope you become aware of how serious contamination, deforestation, global warming… are.

Tipping Points - the Facts
When the temperature gets high enough to cause forests to give up their CO2 rather than sequest it, then every tonne of gas given up to the air increases the temperature and causes even more gas to be given up. This is a tipping point - an irreversible moment when the dreaded feedback loop begins.
This is now the central issue for the scientific community: have humans already have gone too far, and may we now be helpless to stop abrupt and runaway global warming.
These ten major tipping points are are right at this moment being triggered.
  • Melting glaciers will raise sea levels so that less heat is reflected out to space
  • Decline of the flow of fresh water from the Arctic will collapse the Gulf Stream
  • Forests will no longer absorb carbon, but become a source.
  • Methane clathrates held in the mud under the sea begin to burp
  • Melting permafrost releases vast quantities of methane
  • Drought kills the Amazon forest and its carbon sink is released
  • The benefits of being shielded by global dimming ceases
  • Bush fires increase the carbon load and reduce the storage capacity of forests
  • As oceans warm the seas absorb less carbon
  • All the above plus disastrous weather and coral bleaching and acidification of the oceans disrupt food production
Triggering any one of these ten carbon sinks would cause runaway greenhouse warming.
The triggering of any one of them would start off the others.
The earth has over eons stored greenhouse gasses in forests, the soil and in the oceans. Recent scientific research has shown that small rises in temperature can trigger these sinks into becoming sources, and thus tip the scales against our survival.
Only now, in the past five years, has the scientific community begun to pat serious attention to them. We do not know if they will be triggered today or in decades, It seems there is a ten percent possibility that feedback loops from glacial-meltdown, permafrost methane burping and/or rainforest collapse will commence within the next few years.

Source: http://www.planetextinction.com/planet_extinction_tipping_points.htm

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