Originally posted by Nygdan
Prove that it is part of a natural cycle. Climatologists have been trying to decades to match it to a natural cycle, it doesn't match any of them.
THe only causal explanation that fits is that its caused by greenhouse gas emissions.
I guess you haven't read much on the subject then because it is common knowledge that since the start of the Holocene, the last 10,000 years after
the last Ice Age, temperatures have on the overall been steadily increasing meanwhile during those 10,000 years, and even longer, we have had about
two dozen large Climatic Change events.
large climate changes in Europe/Near East during the last 15,000 calendar years (note that these dates are in 'real' years not radiocarbon
14,500 y.a. - rapid warming and moistening of climates. Rapid deglaciation begins.
13,500 y.a. - climates about as warm and moist as today's
13,000 y.a. 'Older Dryas' cold phase (lasting about 200 years) before a partial return to warmer conditions.
12,800 y.a. (+/- 200 years)- rapid stepwise onset of the intensely cold Younger Dryas. Much drier than present over much of Europe and the Middle
East, though wetter-than-present conditions at first prevailed in NW Europe.
11,500 y.a. (+/- 200 years) - Younger Dryas ends suddenly over a few decades, back to relative warmth and moist climates (Holocene, or Isotope
11,500 - 10,500 y.a. - climates possibly still slightly cooler than present-day.
9,000 y.a. - 8,200 y.a. - climates warmer and often moister than today's
about 8,200 y.a. - sudden cool phase lasting about 200 years, about half-way as severe as the Younger Dryas. Wetter-than-present conditions in NW
Europe, but drier than present in eastern Turkey.
8,000-4,500 y.a. - climates generally slightly warmer and moister than today's.
(but; at 5,900 y.a. - a possible sudden and short-lived cold phase corresponding to the 'elm decline').
Since about 4,500 y.a. - climates fairly similar to the present
2,600 y.a. - relatively wet/cold event (of unknown duration) in many areas
(but; 1,400 y.a. [536-538 A.D.] wet cold event of reduced tree growth and famine across western Europe and possibly elsewhere).
(Followed by 'Little Ice Age' about 700-200 ya)
The above are most of the Climatic Change events that have happened for the past 15,000 years, except the Medieval warming period, which started in
the 800s and ended around the 1300s when there was an unusual warming event.
The thing about the Climatic Change event which we are currently undergoing is that there are several natural factors which are converging and
haven't happened together in a long time. Such as the Sun's activity which has increased in the past 60 years more than in the past 8,000 years,
and the heliosphere being weaker allowing more energetic particles to enter our solar system, the fact that the Earth's magnetic field has been
weakening since 1845, and it is now 10% weaker in most areas while at others it is 30% weaker, an event which hasn't happened for 780,000 years.
The above is a record of the polarity of earth's magnetic field for the past 800,000 years.
The above image shows the increase in suspot numbers which has increased in the last 60 years more than in the past 8,000+ years.
The main premise of the "mankind is at fault for Climate Change crowd" is that CO2 emissions have increased which they claim is the reason why
temperatures have increased, and they blame mankind for this.
While it is true that mankind has added CO2 emissions and other gases in the atmosphere, the amount of anthropogenic CO2 and other gases being
released by mankind amount to about 0.28% of what the natural factors release into the atmosphere and is absorbed by our oceans and plants, mostly
absorbed and released by our oceans, which have in store 98.5% of all CO2 in existance.
It is also a known fact that the atmosphere of Earth in the past has had a lot more CO2 than the current levels, which has been fluctuating and
doesn't stay "balanced' for millions of years, as some want to believe.
Since our oceans hold most of the CO2 that is found on Earth, when temperatures increase in the oceans more CO2 is released, and as a matter of fact
temperatures have been increasing before CO2 levels began increasing.
Temperatures have been increasing since the 1600s, meanwhile CO2 emissions started increasing in the middle of the 19th century, only a small part of
it because of mankind activities.
There is also the fact that the geological record has shown us time and again that increases in CO2 emissions always lag temperature increases, that
is, temperatures increase first, then CO2 emissions increase. Which is exactly what has been happening in the current Climate Change cycle we are
Mankind activities are not the reason why temperatures have increased, or why we are in the current Climate Change cycle.
[edit on 4-3-2007 by Muaddib]