Historum - History Forums  

Go Back   Historum - History Forums > Themes in History > Natural Environment
Register Forums Blogs Social Groups Mark Forums Read

Natural Environment How Human History has been impacted by the environment, science, nature, geography, weather, and natural phenomena


Reply
 
LinkBack Thread Tools Display Modes
Old March 27th, 2015, 10:07 PM   #1
Suspended indefinitely
 
Joined: Mar 2013
From: Australia
Posts: 1,566
The history of Climate Change


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?
Boethus is offline  
Remove Ads
Old May 14th, 2015, 08:13 PM   #2
Suspended indefinitely
 
Joined: May 2015
From: United States, west
Posts: 32

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.
Vietnam Veteran is offline  
Old May 14th, 2015, 09:01 PM   #3
Suspended until August 17th, 2017
 
Joined: Mar 2010
Posts: 9,544
Blog Entries: 1

Several Antarctic bases may have to shut this year as the ice floes have gotten so big and thick they cannot be supplied.
Lawnmowerman is offline  
Old May 15th, 2015, 07:53 AM   #4

Lowell2's Avatar
Historian
 
Joined: Jun 2014
From: California
Posts: 5,803

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.
Click the image to open in full size.

Click the image to open in full size. Pleistocene Ice Sheets

http://www.sciencedaily.com/releases...0924153956.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.
Lowell2 is offline  
Old May 26th, 2015, 03:36 AM   #5

Kahu's Avatar
Scholar
 
Joined: May 2015
From: Wellington, New Zealand
Posts: 684
Blog Entries: 1
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/environme...tegration-nasa
Kahu is offline  
Old May 26th, 2015, 04:17 AM   #6

rvsakhadeo's Avatar
Historian
 
Joined: Sep 2012
From: India
Posts: 7,274

Quote:
Originally Posted by Boethus View Post
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.
rvsakhadeo is online now  
Old May 26th, 2015, 04:31 AM   #7

Shtajerc's Avatar
last real Windischer
 
Joined: Jul 2014
From: Lower Styria, Slovenia
Posts: 5,156

Quote:
Originally Posted by rvsakhadeo View Post
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 ...
Shtajerc is offline  
Old May 26th, 2015, 04:44 AM   #8

rvsakhadeo's Avatar
Historian
 
Joined: Sep 2012
From: India
Posts: 7,274

Quote:
Originally Posted by Shtajerc View Post
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 '.
rvsakhadeo is online now  
Old May 26th, 2015, 06:22 AM   #9

rvsakhadeo's Avatar
Historian
 
Joined: Sep 2012
From: India
Posts: 7,274

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.
rvsakhadeo is online now  
Old May 26th, 2015, 06:31 AM   #10
Historian
 
Joined: Oct 2012
Posts: 8,545

Click the image to open in full size.

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.
constantine is offline  
Reply

  Historum > Themes in History > Natural Environment

Tags
change, climate, denial, extinction, koch brothers



Search tags for this page
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Before Climate Change was around... Congo Natural Environment 57 September 26th, 2014 11:27 PM
mpact of climate change on politics Port Philosophy, Political Science, and Sociology 2 September 22nd, 2014 03:25 PM
Climate Change (% influenced by Man) Congo Natural Environment 713 June 21st, 2013 04:09 PM
climate change c.500 BC ? Widdekind Ancient History 34 March 31st, 2012 03:36 AM

Copyright © 2006-2013 Historum. All rights reserved.