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Apart from temperature and storm events, the biggest
measurable change is in the ocean
In May 2013 the USA's National Oceanic & Atmospheric
Administration (NOAA) revealed that the daily mean concentration of
carbon dioxide in the atmosphere of Mauna Loa, Hawaii has surpassed
400 parts per million (ppm). This is the first time this has happened
since measurements began in 1958. The world average is 394ppm.
Exactly how much is that? Well, it's the highest level in 800,000
years as can be seen in this great YouTube graphic,
courtesy of NOAA.
So what does this all mean? It explains why we've had a steady
increase in temperatures, and many more extreme weather events than
previous decades. The ABC's Catalyst aired ‘Extreme
Weather' on 4 July, which discusses these extremes of heat and
cold over the last few years and explains how and why they come about.
from Berkeley Earth also shows the last 200 years of land temperature
rise. My favourite part is that it shows the temperature readings
starting in the British Colonies and spreading across the world.
Australia's data either wasn't there, wasn't consistent or wasn't
deemed accurate enough till the 1840s.
The Berkeley Earth data was gathered by Richard Muller, Professor of
Physics at the University of California at Berkeley. He was one of the
more qualified climate change sceptics. He gathered that data
intending to prove that the climate change camp was manipulating data
to show a rapid recent increase in temperature. He found out the
climate scientists were wrong - the temperature change he found was
actually higher. In the face of such overwhelming evidence,
he changed his opinion and is now a staunch supporter of climate change.
Apart from temperature and storm events, the biggest measurable
change is in the ocean. Below are two great TED talks about the impact
of climate change on the ocean.
In the first one, Jame Balog gives a great TED talk about loss
of Arctic and glacial ice. The talk is from a few years ago and
it's now been turned into a movie documentary called Chasing
Ice. Check out the trailer at http://www.chasingice.com/.
In the second TED talk, US Rear-Admiral David Titley makes some interesting
strategic points about global warming and rising sea levels (you
can skip to 15.30 to get to the juicy strategic stuff). He calls
climate change "one of the pre-eminent challenges of this
century". I tend to feel that by the time the military are
talking about something openly, they've probably been talking about it
privately for 20 years.
Some other great sites;
Australian Academy of Science http://www.science.org.au/nova/environment/climate-change/
Eureka Award winning Skeptical Science http://www.skepticalscience.com/