Evidence is emerging that the mass extinctions of species was caused by changes to the worlds oceans and the earths atmosphere. Current thinking is
that metor strikes were the cause of mass extinctions. The most famouse example behind current thinking is the current theroy behind the mass
extinction of the Dinosaurs.
As researchers continued to probe the data in recent years, however, they found that some things did not add up. New fossil analyses indicated that
the Permian and Triassic extinctions were drawn-out processes spanning hundreds of thousands of years. And newly obtained evidence of the rise and
fall of atmospheric carbon, known as carbon cycling, also seemed to suggest that the biosphere suffered a long-running series of environmental insults
rather than a single, catastrophic strike.
That is because photosynthesis largely drives changes in the 12C-13C ratio. Plants use energy from the sun to split carbon dioxide (CO2) into organic
carbon, which they exploit to build cells and provide energy; happily for us animals, free oxygen is their waste product. But plants are finicky, and
they preferentially choose CO2 containing 12C. Thus, when plant life--whether in the form of photosynthesizing microbes, floating algae or tall
trees--is abundant, a higher proportion of CO2 remaining in the atmosphere contains 13C, and atmospheric 12C is measurably lower.
n today's oceans, oxygen is present in essentially equal concentrations from top to bottom because it dissolves from the atmosphere into the water and
is carried downward by ocean circulation. Only under unusual circumstances, such as those that exist in the Black Sea, do anoxic conditions below the
surface permit a wide variety of oxygen-hating organisms to thrive in the water column. Those deep-dwelling anaerobic microbes churn out copious
amounts of hydrogen sulfide, which also dissolves into the seawate
Please visit the link provided for the complete story.
I dont know were to start. The evidence that has been discovered could go a long way towards explaing global warming. The species known as Humans
could be headed for real trouble. I always thought that we kill ourselvs via nuclear weapons or some other kind of conflict but it appears as if
changes to the earths atmosphere and oceans could cause us to become a part of the next mass extinctions.
Are we seeing the warning signs already ?
Bear in mind that we are already destorying the Amazon rain forest at a rapid rate and this is without the changes that are or have taken place to the
The evidence also points to what seems to be a more sound theroy IMO then current thinking due to the fact that the large amounts of material
generated from a metor strike was able to block the Sun but wasnt pulled to the ground by earths gravity.
Related News Links: