by Harijan on Thu Mar 27, 2008 11:27 am
1. There are three different issues being discussed here that are all very different, very related, often misunderstood, and criminally interchanged by stupid journalist.
A. Global warming - just the simple question - is the average temperature globally increasing, if so by how much, how fast, and is this different from historical patterns.
B. Greenhouse effect - A scientific theory concerning the impact of increased levels of C02 (and other gases) on atmospheric temperature.
C. Climate change - Are local climates changing at a rate that is higher than historically observed, and what is the long-term impact of these changes.
When debates like this one start, there tends to be copious amounts of sloppy arguments in which all three issues are discussed without laying our limitations and relationships. So here I go at laying a ground work for each one.
A - Global warming
1. Yes - it is happening, but at this point the temperature increases are so small, and the data set so limited in time and uniformity that even climatologist admit that they cannot tell how much global temperatures have changed for more than 25 years (since satellites started reporting data).
2. Yes – it is very probable even to a point of certainty that a global warming trend will cause widespread climate change. But we do not know the extent or nature of these changes.
3. No - there is not a consensus in the scientific community on what is causing global warming. Opinions among climatologist include, but not limited to, (in no particular order):
a. Greenhouse effect
b. Higher energy outputs from the sun
c. The natural pattern of global temperature change
4. No – There is no way for us to know how much the earth is going to heat up. Climate forecast models range from a few degrees to 20+ degrees (keep in mind these are the same guys who cannot accurately predict the temperature 3 weeks from today). And furthermore, we have no idea what impact this will have on the environment, or climate change, but as Neo pointed out, the popular opinion right now is that nothing good will come from global warming.
I strongly disagree with this popular opinion. Not only do we not know what the impact of global warming will be, we are succumbing to media rhetoric on the issue. It is entirely possible that global warming could be the biggest travesty to occur since the last ice age, but it could also create millions of square miles of usable land. The fact of the matter is no one knows, and our efforts at this time should be focused on understanding the issue before we act on it.
Neo brought up the horrid track record scientists have when they try to repair ecosystems. The primary reason we almost always fail to fix damaged ecosystems is because we simply do not understand the entire ecosystem before we start meddling with it. So lets dump billions of dollars into understanding global warming before we dump billions of dollars into fixing global warming. Current popular opinion concerning global warming is akin to hiring a lawn-mower repairman to fix your BMW. We just don’t know enough to get the job done right.
B – Greenhouse effect
Yes – the family of gases termed “greenhouse gases” (primarily Carbone Dioxide and methane) have been causally proven to trap heat in the atmosphere.
Yes – the greenhouse effect is contributing to global warming, which in turn, contributes to climate change. However, in an interesting twist, the established causal relationship between increased greenhouse gases and global warming is not well supported by a correlatory relationship. The logical conclusion of scientist is that there are other things also contributing to global warming, and those other things are having a greater impact on global warming than greenhouse gases.
Yes – the increase in greenhouse gases is caused by human activities. The top two greenhouse gas producers (again, in no particular order) are:
1. Livestock
2. Fossil fuel consumption (both coal and oil)
There are all kinds of terrific reasons why we, as a species need to move away from fossil fuels and meat. I am fully in support of outlawing meat consumption and fossil fuel consumption tomorrow on a world-wide basis, but that’s not going to happen.
C – Climate Change
Yes – macro climates around the world are changing at an increased rate.
No – not all macro climates are getting hotter, some are actually cooling off.
No – there is not a single macro climate that is in danger of collapsing or disappearing as a result of global warming.
Yes – there are a handful of species that are now endangered as a result of climate change (Polar bears are not one of them).
No – Climate change is not necessarily a bad thing. In fact, climate change is the one constant in this whole argument. It is ludicrous to suggest to any ecologist or climatologist that climates and ecosystems are constant or stable. These things are always changing and adjusting to different inputs. Species are always dying out and thriving as a result of climate change. Climates and ecosystems have always, and will always change at varying rates in ways that we perceive as good or bad, but really, climates and ecosystems just change.
Climate change has always been here, and will always be here, and we have no way of separating natural climate change from climate change caused by humans. If we can’t even answer that basic question, how in the hell are we going to “fix” the human factor in the climate change equation?
I am all for protecting the environment. I do my part, keep footprint to a minimum, contribute to my ecopreservation groups, I even do more than just give money, I go out and actually work on community ecology preservation projects. But before we dump billions or even trillions of dollars into stopping the greenhouse effect (which as remi astutely pointed out is all we are really talking about doing) why don’t we fix some of the more pressing problems like deforestization, and marine ecosystem destruction, both of which are beyond critical states, both of which would should decrease the greenhouse effect, and both of which are problems scientist actually understand.
This is essentially Lomborg’s argument as well as mine.
