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| Thread ID: 83145 | 2007-09-20 23:04:00 | Climate change caused by man ? | wmoore (6009) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 593570 | 2007-09-30 05:09:00 | Oh dear, still I disagree. :lol: The thermal expansion you speak of Winston is actually thermal contraction, given that water expands when it freezes. Therefore the sea level will decrease, ever so slightly. As for the proposition that the sea level was once 200 feet higher I’d be interested to hear your explanation as to how it shrunk to present day levels. ;) ok, i've calmed down a bit to answer/correct this nicely sea ice, being less dense than liquid water, will float on top of said water, displacing such a volume that the displaced water is equal in weight to the floating ice. as such, melting sea ice will not change much. BUT, it's ice above the land that is the problem (glaciers, greenland, antarctica etc). first let's begin by pointing out that during ice ages the sea level drops significantly, and without polar ice caps the sea level is much higher than it is today. next let's consider that ice on the land is not in the sea, thus lower sea level while land is covered in ice, and higher sea level when the ice has melted. Finally, consider that antarctica has an ice covered area of 13.72 million square kilometers (5.3 million sq mi), which averages at least 1.6 kilometers (1.0 mi) in thickness. By volume that's 13.72*10^6*1.6 = 21952000 = 22 million cubic kilometers of ice spread that over 361,000,000 square Km of ocean and you get a sea level increase of 22/361 = 0.061 Km, or 61 metres, which funnily enough is the same as the 200 feet quoted earlier in this thread note I have not accounted for any ice outside of antarctica, nor the increase of sea area as land area decreases. |
motorbyclist (188) | ||
| 593571 | 2007-09-30 05:14:00 | That's a slight misrepresentation there Andrew..... The US (and I am not defending this place) has the strictest pollution controls in the world I believe. i hear europe is pretty damn strict too... the point is that per person the states consumes, wastes and emits the most of nearly everything. recently i beleive the US called on china for it's shocking pollution, china's response was to point out that if the states was to match china's consumption/emission per person, global warming and several other global issues would be a thing of the past. (let's hope that as china grows they can keep it that way.) |
motorbyclist (188) | ||
| 593572 | 2007-09-30 05:56:00 | ok, i've calmed down a bit to answer/correct this nicely sea ice, being less dense than liquid water, will float on top of said water, displacing such a volume that the displaced water is equal in weight to the floating ice. as such, melting sea ice will not change much. BUT, it's ice above the land that is the problem (glaciers, greenland, antarctica etc). first let's begin by pointing out that during ice ages the sea level drops significantly, and without polar ice caps the sea level is much higher than it is today. next let's consider that ice on the land is not in the sea, thus lower sea level while land is covered in ice, and higher sea level when the ice has melted. Finally, consider that antarctica has an ice covered area of 13.72 million square kilometers (5.3 million sq mi), which averages at least 1.6 kilometers (1.0 mi) in thickness. By volume that's 13.72*10^6*1.6 = 21952000 = 22 million cubic kilometers of ice spread that over 361,000,000 square Km of ocean and you get a sea level increase of 22/361 = 0.061 Km, or 61 metres, which funnily enough is the same as the 200 feet quoted earlier in this thread note I have not accounted for any ice outside of antarctica, nor the increase of sea area as land area decreases. Good, I take it we agree then that all that spin about melting Icebergs was a load of hogwash. :D Now, just passing, for the moment, on your extended theory on melting land ice, can you please explain how and when the ocean dropped 200 feet? |
B.M. (505) | ||
| 593573 | 2007-09-30 08:49:00 | can you please explain how and when the ocean dropped 200 feet? God stood up and stepped out the bath. |
legod (4626) | ||
| 593574 | 2007-09-30 09:14:00 | If I was God I would levitate out of the bath. | Metla (12) | ||
| 593575 | 2007-09-30 09:37:00 | And not a mention of a superpowered transmorgrifier or a rebigulator...:p | rob_on_guitar (4196) | ||
| 593576 | 2007-09-30 10:58:00 | Good, I take it we agree then that all that spin about melting Icebergs was a load of hogwash. :D Now, just passing, for the moment, on your extended theory on melting land ice, can you please explain how and when the ocean dropped 200 feet? not entirely; receding glaciers and ice sheets, ignoring the amusing land claims and danger to shipping, are a sign the the earth is infact warming - man induced or not as for sea level drop: when you have ice covering northern europe, russia, and america (en.wikipedia.org), that's alot of ice on land about 3-4 Km thick, and apparently causes a 120m (400foot) sea level drop (relative to today's level). believe it or not sea level change does go in both directions. this is how anthropologists believe humans may have spread to the americas and australia so long ago - land bridges opening and closing |
motorbyclist (188) | ||
| 593577 | 2007-09-30 11:01:00 | anything else i need to apply objective reasoning and/or google to? | motorbyclist (188) | ||
| 593578 | 2007-09-30 20:05:00 | I'd just like to pause and say how much I appreciate the level of debate here. We probably can't agree but it is good to get a variety of points of view. Now - Legod - I read your links to those well written articles. What I drew from them is further confirmation of just how complex climate systems are. The data can be reinterpreted when new knowledge becomes available and some studies directly conflict with others. Here is an answer to Schwartz - www.realclimate.org The NorthWest Passage was named before it existed - it was a hoped-for navigable route from the Atlantic across the top of Canada to the Pacific. However many ships were lost and men died trying to find it. Although a passage of sorts exists, it isn't usable by merchant shipping - until now! Sea levels have risen about 1 foot (300mm) over the past 300 years and the rate has increased in the 20th century. |
Winston001 (3612) | ||
| 593579 | 2007-09-30 20:50:00 | not entirely; receding glaciers and ice sheets, ignoring the amusing land claims and danger to shipping, are a sign the the earth is infact warming - man induced or not as for sea level drop: when you have ice covering northern europe, russia, and america ( . wikipedia . org/wiki/Ice_age#Glaciation_in_North_America" target="_blank">en . wikipedia . org), that's alot of ice on land about 3-4 Km thick, and apparently causes a 120m (400foot) sea level drop (relative to today's level) . believe it or not sea level change does go in both directions . this is how anthropologists believe humans may have spread to the americas and australia so long ago - land bridges opening and closing So, you’re saying that once upon a time, (God got out of the bath or Metla levitated) and 200 feet of water rushed up on land and froze there . :eek: Wow, I’m glad I wasn’t gathering shellfish at the time . Would have got a hell of a shock! But, more importantly, who got the Carbon Credits for this phenomenon? God or Metla? :confused: Anyway, I did as you suggested in your other thread and Googled . Blow me down if I didn’t wind up Here ( . co . nz/newreply . php?do=newreply&p=598134" target="_blank">pressf1 . co . nz) I must say I agree with that B . M . fellow . :) |
B.M. (505) | ||
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