The history of Climate Change

Mar 2013
1,566
Australia
#1
From melting glaciers to the West Antarctic Ice Sheet to Greenland to the Siberian tundra, there are multiple challenges ahead for our world. Carbon has moved up to 400 parts per million of the atmosphere, the ocean is acidifying due to the amount of carbon that it's absorbing and methane is possibly an unaccounted for wildcard, a wildcard that is capable of destroying life on this planet.

There have been changes to the climate before but the current readings are very concerning and far past previous levels, for example in the inter-glacial periods carbon parts per million peaked at around 280 and during the glacial periods dropped to about 180.

What can be done?
 
May 2015
32
United States, west
#2
Global Warming, recently renamed "climate change" due to the spate of recent cold over the past seventeen years, is a profoundly sensitive subject. Proponents of AGW, or CC, must provide conclusive evidence of the following:

1. Conclusive evidence of a long-term increase in global warming,

2. Compelling evidence that increasing concentrations of atmospheric carbon dioxide is causing global temperatures, not the reverse,

3. Compelling evidence that the anthropogenic component of carbon dioxide increases is indeed critical to CO2 increases.

4. Compelling evidence that the global effects of an increase in a few degrees will be as devastating as has been and continues to be claimed.

5. Compelling evidence that the anthropogenic component can be sufficiently reduced to effect a material reduction in future warming and consequent devastation.

6. Compelling evidence that earth’s inhabitants can and will reduce the global human carbon footprint to 80% of 1990 carbon dioxide emissions, without catastrophic consequences far worse than the effects of a degree or two or three increase in average global temperatures.

7. Compelling evidence of their own integrity and honesty and lack of bias everywhere, including doing research, presenting data objectively, and avoiding even the appearance of bias.

It is noteworthy that the thread author cited carbon (dioxide) as having increased an *enormous* 120 parts per MILLION. Putting that in perspective, water vapor, the dominant greenhouse gas, is approximately 15,000 parts per million, volume (as opposed to mass).

Moreover, the 120 parts increase is the total, comprised of naturally produced, as well as human produced. Our component is roughly 3.27%, so it takes humans 22 years to increase CO2 by 1 part per million on the base of almost 16,000 ppm.

The hypocrisy of the most stalwart proponents of global warming seem to be the very same folks who fly and drive and burn the most fossil fuels. Take Al Gore, and Barack Obama, and scholars who fly and drive all around the world, to prove what they claim has already been proven.
 

Lowell2

Ad Honorem
Jun 2014
6,541
California
#4
except that the "warming" has been on hold for about 18 years.
Global warming ?pause? expands to ?new record length': No warming for 18 years 5 months | Climate Depot

It's not as if the planet hasn't had periods of climate change -- it's clear that the glacial extent of the ice age has withdrawn -- good thing, since much of the land now occupied by people in Europe and N. America was under ice during that period. So how much warming is "bad"? The assumption that only if the climate is static is it correct is both anthrocentric and ignorant of climate history.


Pleistocene Ice Sheets

http://www.sciencedaily.com/releases/2013/09/130924153956.htm --Late Cretaceous Period was likely ice-free.
-- maybe it was global warming by virtue of sauropod farts.

yes, the climate has changed. As if it wasn't changing before people and won't change after humans are either extinct or have left the planet.
 
May 2015
776
Wellington, New Zealand
#5
Vast Antarctic ice shelf a few years from disintegration, says Nasa

The last intact section of one of Antarctica’s mammoth ice shelves is weakening fast and will likely disintegrate completely in the next few years, contributing further to rising sea levels, according to a Nasa study released on Thursday.

The research focused on a remnant of the so-called Larsen B Ice Shelf, which has existed for at least 10,000 years but partially collapsed in 2002. What is left covers about 625 sq miles (1,600 sq km), about half the size of Rhode Island.
Antarctica has dozens of ice shelves – massive, glacier-fed floating platforms of ice that hang over the sea at the edge of the continent’s coast line. The largest is roughly the size of France.


http://www.theguardian.com/environment/2015/may/15/antarctic-ice-shelf-larsen-b-disintegration-nasa
 
Sep 2012
8,924
India
#6
From melting glaciers to the West Antarctic Ice Sheet to Greenland to the Siberian tundra, there are multiple challenges ahead for our world. Carbon has moved up to 400 parts per million of the atmosphere, the ocean is acidifying due to the amount of carbon that it's absorbing and methane is possibly an unaccounted for wildcard, a wildcard that is capable of destroying life on this planet.

There have been changes to the climate before but the current readings are very concerning and far past previous levels, for example in the inter-glacial periods carbon parts per million peaked at around 280 and during the glacial periods dropped to about 180.

What can be done?
It is not ' carbon ' that has gone upto 400 ppm in the atmosphere but it is the amount of Carbon Di Oxide, the gas. And it is the concentration of the gas CO2, that causes the hothouse effect, if the concentration is high and on the other hand will cause all heat reflected from earth's surface to escape into the empty space beyond the atmosphere, if the CO2 concentration is extremely low or the gas is not there at all. Let us be accurate in discussing this technical matter.
 

Shtajerc

Ad Honorem
Jul 2014
6,466
Lower Styria, Slovenia
#7
It is not ' carbon ' that has gone upto 400 ppm in the atmosphere but it is the amount of Carbon Di Oxide, the gas. And it is the concentration of the gas CO2, that causes the hothouse effect, if the concentration is high and on the other hand will cause all heat reflected from earth's surface to escape into the empty space beyond the atmosphere, if the CO2 concentration is extremely low or the gas is not there at all. Let us be accurate in discussing this technical matter.
Carbon actually is one of the problems in some parts of the word aswell. If people heat with coal, wood or similar, soot can acummulate on glaciers or cause gray snow. This ice or snow that isn't white anymore then absorbs more sun energy, which means more warmth and further melting. I think that's a problem in Tibet, where the Chinese have problems with their railroad or something. Forgot a bit what exactly it was about ...
 
Sep 2012
8,924
India
#8
Carbon actually is one of the problems in some parts of the word aswell. If people heat with coal, wood or similar, soot can acummulate on glaciers or cause gray snow. This ice or snow that isn't white anymore then absorbs more sun energy, which means more warmth and further melting. I think that's a problem in Tibet, where the Chinese have problems with their railroad or something. Forgot a bit what exactly it was about ...
Of course, the particulate matter in the atmosphere is a big cause of respiratory diseases etc. and the particulate matter will include carbon particles e.g in the atmosphere near thermal power plants or coal washeries etc. but the O.P.is referring to 400 ppm in the atmosphere and that certainly is the measure of CO2 pollution and not ' carbon '.
 
Sep 2012
8,924
India
#9
The best alternative to the burning of fossil fuels is to go in for renewable energy sources in a big way. The solar energy option is attractive, though costly. Also attractive is wind energy option. And if we can have good safe designs, the nuclear energy option is also good.
In any case, we must conserve our fossil fuels, whether they cause global warming or not.
 
Oct 2012
8,545
#10


The world is about as cold as it has been in 450 million years, so this obviously isn't a stable situation. I'd expect us to exit the current ice age at some point, probably in the near future, relatively speaking.
 

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