I think you're reading it wrong.No what they mean by that is that they can use data stretching back 800,000 years as part of their temperature modeling and comparison making, not that man made GW was happening back then.
I think you're reading it wrong.No what they mean by that is that they can use data stretching back 800,000 years as part of their temperature modeling and comparison making, not that man made GW was happening back then.
I think you're reading it wrong.
I think we're both reading it the way that makes our case. And since I'm a self-absorbed narcissist, that makes your interpretation wrong.What makes you say that?
are you dismissing her argument just because she is young?
No what they mean by that is that they can use data stretching back 800,000 years as part of their temperature modeling and comparison making, not that man made GW was happening back then.
I think we're both reading it the way that makes our case. And since I'm a self-absorbed narcissist, that makes your interpretation wrong.
So you were hanging around with a thermometer back then so that we have actual calibrated temperature data to compared their model outputs with? Somehow I expect not....
Or more likely they can look at things like ice samples and check the levels of CO2 and so forth, look at any fossilised animals and do the same I guess. There's a lot of information stored in all manner of places - Ice, rock, water, bones, soil...
There sure are lots of sources and they all require the same thing, a calibration standard. The ways that these sources act as a proxy for some other value and the calibration standard to be used, are not always clear cut and generally accepted.
Like the tree rings who's proxy ability from measured temperature over the last 50 years. They're claimed to be accurate from 1960 back 1000 years but not now. Apparently something magical happened in 1960 that no one is willing to explain, that made trees stop responding to temperature.
My thoughts are, if its not a good temperature proxy now, its not a good temperature proxy at all.
Bubbles in Ice cores may not even be a good indicator of CO2 levels. There is evidence that glacial ice can be semi-permeable to certain gasses, including CO2, meaning the CO2 levels in the bubble may not represent the CO2 levels of the parent air....
AP? Advanced Placement? Are you still in high school?
I've got an engineering degree with all the math and physics that entails including a couple semesters of partial differential equations and still don't have a complete understanding of the underlying scientific issues. Thats even considering my work background is in data reduction and analysis, computer modeling and feedback control systems.
Somehow I think you need a little more education/experience under your belt in order to really start understanding this. Although for high school you're aren't doing too bad. :thumbup
Not in the least. Any argument I dismiss will be because its factually incorrect.
Aside from the issues I've identified in prior post, her arguments are very well put together and I agree with most of them. On top of that, she's one of the more well written teenagers I've come across in a while. If I had to give a recommendation based on what she's written here, I'd say to go into some field of science because I think she's got a knack for it. :thumbup
The few conceptual issues just didn't make sense until I realized she was in HS. Up through high school, science is pretty much taught as relatively simple cause/effect relationships. In the real world, there are only a few relationships that are that simple. These days the bulk of science is determining nuances of the complex relationships and which factors can or should be ignored.
Ultimately the debate over climate change and its effects stems from the investigation of these nuances and what the overall interaction is.
Take the arctic ice issue I pointed out where the wind is disturbing the ice causing it to retreat. The simple cause/effect says that if the temp is above freezing, ice will melt, therefore retreating arctic ice is a sign of warming. The more complex answer takes into account the fact there are sublimation effects that vary with sunlight intensity, variations in ocean currents, variations in wind patterns, variations in precipitation patterns and many more factors along with variations in temperature. One or all of those factors can be whats causing the variation in ice extent, and typically its a combination.
Age only plays in because you just don't get to the level where the concepts of complex interaction are explained till at least college (unless you happen to be some child prodigy enrolled in a VERY good magnet school). Honestly thats a sad testament to our school systems because we could very easily get kids a position to be learning these things in high school. :thumbdown
Try not to change the subject when I point out your errors. You were talking about arctic sea ice not Greenland, Antarctica or inland glaciers.
Here's a nice graph showing that just as I said, we have gained some ice extent in the last couple of years. If we are currently gaining extent year over year, by definition there is no loss acceleration.
Here's a video based on NSIDC data showing arctic ice extent from 1979-2009. Notice just how typical things look year after year.
YouTube - Arctic Sea Ice timelapse from 1978 to 2009
Again, here's video of the wind patterns disrupting the arctic ice.
YouTube - Arctic ice driven by the wind not global warming
Now if you want to talk about the large ice masses of Greenland, Antarctica and inland glaciers, then we most certainly can talk about them. We can talk about the physical mechanics of these ice masses, the time lag of ice accretion, melting and glacier motion and the impact of climactic variations 100s and even 1000s of years ago on the current state of the ice mass along with how all those and other complex factors can play into ice mass growth or decline just as much as a simple change in average temperature....
Other than the fact southern ocean is colder than normal according to NOAA, you're 100% right.
Who the said anything about polar bears? My understanding is that polar bear populations were poorly documented and understood before the 1970s and that the information we have since then has been of a population recovering from over hunting. Given those facts, what exactly is a "normal" population of polar bears? Is it possible that the recovering population overshot the carrying capacity of their habitat and is now correcting? What sort of cyclical patterns (short and long term) does the population undergo?
I'm not about to deny an easily quantifiable fact, but until the answers to those and quite a few other questions are known and well understand, I'd be very hesitant to attribute the decline to any particular factor.
You know what? It might also have a lot to do with the fact we had a relatively strong La Nina event over the last year or so which has a strong correlation with low rainfall in south central TX (along with other areas) and high rainfall in north TX. How much you wanna bet conditions reverse when the El Nino thats firing up right now get going?
Considering TX state climatological records only go back to 1895, saying "its the worst drought ever" isn't saying all that much. When you've only been paying attention for a relatively short period of time, its rather ridiculous to assume that anything you haven't seen before is outside the norms. It may be a rare occurrence but entirely within the normal bounds of the system.
I could predict a drought in TX sometime in the next 20 years and probably be right too. Doesn't mean I know WTF is going on with the climate of the world, just that I know its typical that TX has a major drought every 15-20 years on average.
And what about all the predictions that have been made that HAVE NOT come true? To ignore those is to fall into confirmation bias...
Show me some evidence that disease is spreading outside of third world countries. Spreading disease in third world countries with horrible sanitation, prevention and health care is nothing new.
In the complex interconnected dynamic system that is the world, there are plenty of other potential explanations for a lot of what you claim is connected to climate change, you're just choosing not to admit to them. As far as magnitude, its probably better to rely on the satellite temp data(UAH orRSS) which shows a continuation of the slow steady warming thats been observed for a long time, rather than looking to other phenomena with rather tenuous connections to temperatue.
There are a lot of people who would dispute that given the the prior correlation between solar activity and climate variation and our recently very active sun. There's also the fact that we've been steadily warming since the end of the "little ice age" before large scale industrialization and emission of CO2.
Seriously, just WTF makes you think a climate system that has proven itself relatively stable for longer than we as a species have been alive, will suddenly become unstable simply because we are changing the gain on one single feedback path that is known to have an exponential decay in effect?
Again, the climate is changing. That is fact. The question is how much are we contributing.
As we run out of oil, the price will go up and people will develop new technologies and new habits to mitigate its effects.
To force half-assed solutions to an as yet non-existent problems is to force waste on humanity at large, potentially taking resources from future technologies that really could solve future energy issues.
Every option you listed has very real and very serious problems that limit their applicability.
The question has to be changed to "what is the cost vs the benefit." Don't fall into the trap that these changes have no cost, especially if they are mandated changes outside what is economically viable.
Leave them alone Bri, they KNOW the earth is flat.....:24::24:
I'm confused... since when does having an engineering degree make you know anything more then me about climate change?
Have people invested over 10'000$ in you to learn about climate change?
Weird, because they have me... perhaps I am not as under educated as you think.
And I have been trained differently. Most of my sceintfic education, especially in climate change, has been through outside programs. In field operations and education.
Many people dismiss climate change, without realizing it is to complex to come up with the correct answer (is it real or is it not) without years of study and education.
That's why I look at climate change with a high enough probability of being real, to do something about it, because we risk so much when we don't.
First, evidence that ice is indeed disappearing:
Greenland Ice Mass:
Time series of ice mass changes for the Greenland ice sheet estimated from GRACE monthly mass solutions for the period from April 2002 to February 2009. Unfiltered data are blue crosses. Data filtered for the seasonal dependence using a 13-month window are shown as red crosses. The best-fitting quadratic trend is shown (green line). (Velicogna 2009)
Ice mass changes for the Antarctic ice sheet from April 2002 to February 2009. Unfiltered data are blue crosses. Data filtered for the seasonal dependence are red crosses. The best-fitting quadratic trend is shown as the green line (Velicogna 2009).
Glaciers
Annual change in global glacier thickness (left axis, meters of water equivalent, m/yr) and cumulative value (right axis, m), based on surface area-weighted mass balance observations. Dates of major volcanic eruptions are shown, since stratospheric aerosols have a cooling effect on climate. Red arrow highlights volume rate change (source: NSIDC) .
Arctic Sea Ice
September Arctic Sea Ice Extent (thin, light blue) with long term trend (thick, dark blue). Sea ice extent is defined as the surface area enclosed by the sea ice edge (where sea ice concentration falls below 15%).
Why Antarctica's Ice is Increasing:
The hole in the ozone layer above the South Pole strengthens cyclonic winds that circle the Antarctic continent. The wind pushes sea ice around, creating areas of open water known as polynyas. More polynyas leads to increased sea ice production. Another contributor is changes in ocean circulation which cause less heat is transported upwards from the deeper, warmer layer. Hence less sea ice is melted.
Figure 5: Surface air temperature over the ice-covered areas of the Southern Ocean (top). Sea ice extent, observed by satellite (bottom). (Zhang 2007)
Polar Bear Argument:
First, it's important to note that scientists lack historical data on polar bear numbers—they only have rough estimates. What we do know, though, is that in the 1960s, polar bear populations dropped precipitously due to over-hunting. When restrictions on polar bear harvests were put in place in the early 1970s, populations rebounded. That situation was a conservation success story ... but the current threat to polar bears is entirely different, and more dire.
Today's polar bears are facing the rapid loss of the sea-ice habitat that they rely on to hunt, breed, and, in some cases, to den. Last summer alone, the melt-off in the Arctic was equal to the size of Alaska, Texas, and the state of Washington combined—a shrinkage that was not predicted to happen until 2040. The loss of Arctic sea ice has resulted in a shorter hunting season for the bears, which has led to a scientifically documented decline in the best-studied population, Western Hudson Bay, and predictions of decline in the second best-studied population, the Southern Beaufort Sea.
Both populations are considered representative of what will likely occur in other polar bear populations should these warming trends continue. The Western Hudson Bay population has dropped by 22% since 1987. The Southern Beaufort Sea bears are showing the same signs of stress the Western Hudson Bay bears did before they crashed, including smaller adults and fewer yearling bears.
At the most recent meeting of the IUCN Polar Bear Specialist Group (Copenhagen, 2009), scientists reported that of the 19 subpopulations of polar bears, eight are declining, three are stable, one is increasing, and seven have insufficient data on which to base a decision. (The number of declining populations has increased from five at the group's 2005 meeting.)
Lastly, I'm not going to respond to the rest of you're arguments, simply because there is no solid logic or evidence, on you're side, to back them up, and I really just don't want too.
Solar activity has shown little to no long term trend since the 1950's. Consequently, any correlation between sun and climate ended in the 1970's when the modern global warming trend began.
Over the past century, Earth's average temperature has increased by approximately 0.6 degrees Celsius (1.1 degrees Fahrenheit). Solar heating accounts for about 0.15 C, or 25 percent, of this change,
Because, we are creating a viscous cycles. The climate has never changed (in our history of climate changes, of course) due to carbon before. There will be many carbon feedbacks from perma-frost melting, droughts & fires detroying forests, etc.
We add carbon to the atmoshpere, the atmostphere warms, causing this to release more carbon, we also add more carbon, causing the atmoshere to warm, and more carbon is released from the atmoshpere... thiis ecomes a cycle that wuikcly goes out of control, of natural bounds. eventually, carbon saturation could break this cycle, the only problem is: We don't know at what point this will happen.
The environment has natural checks and balances, but creating a man-made environmental catastrophe could easily over ride these balances--simply because it isn't natural. And I know, eventually, in a few thousands of years, the earth will probably go back to normal. But there is a good chance we could have gone extinct by them.
So why did you just make me respond to an argument that sea ice isn't melting implying that you are arguing the climate is indeed not changing?
You don't get the f idea here. We are going to have to do what I am saying anyways: Find green energy, so we might as well do it now, so we can prevent climate change from happening if we are indeed causing it.
How would jump starting the search for a solution now, cause us to develop less technology in the future, I would think it would make us develop that same technology--but faster...
I agree, which is exactly why we are not currently utilizing them. And is also why I am suggesting we start researching them and investing in them so we can get them to work.
Last I checked, but riskig political, economic, and environmental collapse is a bit more important to worry about then "Are we getting what we are paying for?"
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