Climate Change Is Not an Imminent Danger
Right, last round my sources had a problem, but I’ve reposted them in the comments
section. I thank my opponent for the fantastic debate, and may the best arguments
win. C1: Public Health First, I’d like to note that Pro hasn’t addressed my points
about dengue fever or yellow fever. To argue that infections decrease in warming periods
misses the fact that over the past century or so we’ve made significant strides in
treatments for tropical diseases such as malaria, as well as in fighting mosquito
outbreaks[cite]. My argument is that all things being equal, an increase in temperature
results in an increase in the spread of mosquito-born diseases. The fact that malaria
can survive outside of the tropics is rather incidental to whether or not it is more
virulent in the tropics. Pro concludes that since malaria rates have decreased over
time, and it has happened outside the tropics, malaria would not be affected by global
warming. The problem with this is that malaria rates (and pretty much every other
tropical disease rate) responds to whatever’s forcing it, just like climate. Keep your temperature steady and leave standing water everywhere and you get more
malaria. Kill mosquitos and keep everything else constant and malaria rates drop.
We know that malaria is more virulent in warmer areas[1]. Therefore, as the world
warms, we either are faced with an increase in malaria cases or have to expand our
public health infrastructure to prevent them from occurring in the first place. The
first can result in an increase in deaths, the second would have to be very well planned
to avoid all deaths and would still result in economic damages. Ergo, we can conclude
that a warming world presents risk. As far as heat deaths, this data may be true for
the UK and Germany, but it is not necessarily true universally. Many low-income areas
are in hot areas rather than cold ones, so quite conceivably that could cause there
to still be a net increase in fatalities. C2: Sea Level Rise I don’t argue for an
apocalypse where the ocean rises twenty feet. First I’d like to note that Tuvalu has an average elevation of about six feet above
sea level. The highest point is fifteen feet[2]. So it doesn’t necessarily take much to cause
damage. Also, there are waves, and tides, so even if a given area would still be above
average sea level, that doesn’t mean it won’t get water damage. Secondly, sea level
rise isn’t going to be constant everywhere. This is due to a variety of factors, such
as the gravitational pull of the Earth being slightly different in different locations,
temperature variations, and tectonic plates[3]. Unfortunately for Tuvalu, it sits
in what is probably the most unfortunate location a bunch of low-level coral atolls
could[4]. Sea level in Tuvalu rises about three times as fast as in other locations[5].
About 2.8 inches could matter quite a bit for an island that’s about six feet above
sea level when one accounts for the fact that for them it could quite possibly be
more in the range of 8 inches. This same reasoning can be applied to other locations.
Brazil is close to an area that has a higher sea level[6]. As to Pro’s claim that
sea level is falling, the only thing that his source says that supports that is that
the level fell slightly in one specific area in Western Canada, by .5 mm. That is
hardly a global sea level drop, and satellite data confirms that sea level is rising[7].
C3: Ocean Acidification That same paper cited concedes that calcification would be
adversely impacted. As calcifying organisms are an essential part of the food chain,
this doesn’t do much to dismiss my claim that ocean acidification poses a risk. In
relation to the claim that increased carbon dioxide could be beneficial to shells,
experiments with increased concentrations of carbon dioxide in seawater where shells
are growing refute that. Shell dissolution is far more affected than shell calcification[8],
in any event. While it’s true that pH isn’t fixed in the ocean, that doesn’t mean
that shifting the whole range of pH values downwards, towards the more acidic end
of the scale, would necessarily be acceptable. If I’m adapted to survive climates
of 10-20 degrees Celsius, and it shifts upwards two or three degrees, I’m experiencing
significant environmental stress. Since a drop in pH of one (say, from four to three)
is a tenfold increase, since pH is a logarithmic scale, the problem with pH is even
bigger. C4: Cloud Forests It’s true that Lawton’s paper shows that deforestation is
having a significant effect on the cloud forests. It would be a mistake, however,
to conclude from this that global warming has no effect. Modeling has demonstrated
that increases in carbon dioxide would indeed affect the cloud forests[9]. Obviously
deforestation has an effect to, as does general land use, but it can’t be gathered
from the fact that damage to the cloud forests is caused by multiple factors that
global warming has no effect. It is true that precipitation, in some regions, increases
due to global warming. And it’s true that worse droughts have happened in the past.
However, I must ask my opponent: Would you prefer a severe drought that is less severe
than a massive drought that caused widespread damage, or would you prefer no drought
at all? As Pro’s own source points out, droughts that are accompanied by warmer temperatures
impact the environment more. Furthermore, global warming alters air circulation patterns,
causing the distribution of moisture to change[11]. Even if all else remains equal, certain parts are going to get drier and other
parts will get wetter--which has the potential for negative consequences, as noted
in my source. For instance, recent droughts in the Sahel are expected to increase
in severity due to global warming. Conclusion: I’ve demonstrated that the evidence
points towards global warming not being due to the Sun—while I haven’t demonstrated
that humans caused global warming, I don’t really need to. Given that the equations
that are the current scientific consensus about how to predict warming match up with
real observations, we can reasonably conclude that they are correct. Meanwhile, I’ve
shown that any economic or health benefits from a warming world would be far outweighed
by the costs—ocean acidification, sea level rise, loss of cloud forests, increase
in heat stroke deaths, and spread of several virulent diseases. books.google.com/books?id=FhfuV22JZ_sC&pg=PA30#v=onepage&q&f=false http://en.wikipedia.org...
http://www.sciencedirect.com... http://www.skepticalscience.com... http://www.sciencedirect.com... http://www.skepticalscience.com...
http://www.skepticalscience.com... http://www.ncbi.nlm.nih.gov... https://www.geo.umass.edu...
http://uanews.org... http://onlinelibrary.wiley.com...