Is Global warming happening yes or no. Is it anthropogenic Yes or No?
I am polling different interest groups so have your say on the topic.
I am polling different interest groups so have your say on the topic.
credo quia est absurdum
Favorite Answer
Here is truth about global warming:
Global warming is one-half of the climatic cycle of warming and cooling.
The earth's mean temperature cycles around the freezing point of water.
This is a completely natural phenomenon which has been going on since there has been water on this planet. It is driven by the sun.
Our planet is currently emerging from a 'mini ice age', so is
becoming warmer and may return to the point at which Greenland is again usable as farmland (as it has been in recorded history).
As the polar ice caps decrease, the amount of fresh water mixing with oceanic water will slow and perhaps stop the thermohaline cycle (the oceanic heat 'conveyor' which, among other things, keeps the U.S. east coast warm).
When this cycle slows/stops, the planet will cool again and begin to enter another ice age.
It's been happening for millions of years.
The worrisome and brutal predictions of drastic climate effects are based on computer models, NOT CLIMATE HISTORY.
As you probably know, computer models are not the most reliable of sources, especially when used to 'predict' chaotic systems such as weather.
Global warming/cooling, AKA 'climate change':
Humans did not cause it.
Humans cannot stop it.
Dana1981
To the first question - undoubtedly yes. The temperature record is quite clear on this.
To the second question - humans are the primary cause of the current warming (80-90% responsible for the warming over the past 30 years), so for the most part yes.
ironclownfish
Yes both. I posted a question a couple of days ago that asks for opinions on global warming and EVIDENCE to support those opinions. I have gotten excellent answers on why global warming is happening and why it is anthropogenic, but NONE that say it is false. The reason is: those people have no evidence.
Anonymous
1. The globe does appear to be warming but recent research indicates it is not warming at the rate previously thought. Anthony Watts is leading an effort to photograph and document the quality of weather stations. In the US, they have documented about 1/3 of the stations so far. Watts reported that only 15% of the documented stations met the minimum requirements set by the NOAA. 95% of the poor quality stations have a warm bias. This creates a step-wise warming bias in the temperature record. It appears that about half of the recorded temperature increase is not real but an artifact of these poorly sited stations.
http://surfacestations.org
http://gallery.surfacestations.org/UCAR-slides/index.html
The rate of warming is within normal climate variation and not a problem.
Other evidence put forward as evidence of warming may be problematic is usually not put into proper context. It is true that the Arctic Sea ice is melting and the Northwest Passage is opening. However, this has happened before in 1905 and 1944. It is part of a natural cycle and the ice always comes back. Also, Antarctic sea ice is not melting and Antarctic land ice is growing. This indicates the Arctic melting is due to regional climate. In fact, in Laxon's peer-reviewed paper he claimed Arctic melting was due to dynamic forcings (wind and ocean currents) and not thermal or radiative forcings from global warming.
http://www.cpom.org/research/swl-nature.pdf
2. Undoubtedly, some of the warming is caused by man, but not a dangerous amount. Watts will complete the survey of all of the GHCN weather stations around the globe in a couple of years. At that point we will know much more closely the amount of warming that is real. Portioning the warming between normal climate variability and mankind is difficult. Climate variability comes from both external forcings such as solar variation and from internal climate variability such as oscillations in the oceans. One of the most powerful of these is the Pacific Decadal Oscillation (PDO). It oscillates back and forth between a warm phase and a cool phase. Each phase will last 30-40 years. It just entered its cool phase. Compare the global temperature record with the PDO and the correlation is remarkable. I believe it is very possible that a large part of the recent, gentle warming is due to the PDO.
http://en.wikipedia.org/wiki/Pacific_decadal_oscillation
Bob
Yes and yes.
Look here if you have doubts:
http://www.globalwarmingart.com/wiki/Image:Climate_Change_Attribution.png (short)
Meehl, G.A., W.M. Washington, C.A. Ammann, J.M. Arblaster, T.M.L. Wigleym and C. Tebaldi (2004). "Combinations of Natural and Anthropogenic Forcings in Twentieth-Century Climate". Journal of Climate 17: 3721-3727 (medium)
http://ipcc-wg1.ucar.edu/wg1/Report/AR4WG1_Print_Ch02.pdf (very long and detailed)
Or go here if you like an easy website:
http://profend.com/global-warming/