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Duration: 10:54 minutes Upload Time: 2007-10-11 20:12:11 User: wonderingmind42 :::: Favorites :::: Top Videos of Day |
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Description: Part of the "Expansion Pack" of videos accompanying the video "How It All Ends." See "How It All Ends: Index" for a roadmap to guide you through the expansion pack. |
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| TheRealArchAngel ::: Favorites 2008-01-21 01:25:58 Permafrost,soil and just volume disputation also accounts for free CO2 not in the Oceans or mid circulation. Numbers don't add up because of that and the fact that Plants of all types will gorge on the "boon" __________________________________________________ | |
| TheRealArchAngel ::: Favorites 2008-01-21 01:15:54 The CO2 Cycle, Where Inert Co2 rides up with water vaopr during cloud formation is about 1% to 3% worldwide depending where and tempature blah,blah and is what rains on plants to feed them. the .036 and .04 is a little dubious difference as measurement tools vary, and inert CO2 never mixes with GHG in Air. __________________________________________________ | |
| TheRealArchAngel ::: Favorites 2008-01-21 01:11:21 Also, in the Cycle of Life Trees that Hibernate release all their CO2 adding to the circulating Co2, then recapture them when and if they Come Back and Fallen and dead trees release Co2 into the atmosphere on death. __________________________________________________ | |
| TheRealArchAngel ::: Favorites 2008-01-21 01:09:12 Want to note that that There is way more Oil and Coal then there was life on earth and "spent wells" are slowly refilling and Oil and Coal are usually related to areas with Diamonds,gems,and Volcanic activity making modern scientist suspect that Oil and Coal is "lava rock" and not "Fossils" __________________________________________________ | |
| hrdwrkstudent ::: Favorites 2008-01-15 17:10:04 Thanks for your hardwork producing these videos dude. __________________________________________________ | |
| bruce20705 ::: Favorites 2007-12-28 19:47:26 I learn in my geology class, that erosion and leaching of rocks absorbs carbon dioxide. Some scientist suggest that the creation of mountains in the past have lead the world to cool, through the absorbtion of Co2. Thought it was a fun fact, to share. __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:28:07 14. Because this amount is cancelled by plants, it is important to compare this figure with CO2 emission from other human activities. I drive a 1995 Dodge Intrepid 29 miles to work each way according to Mapquest. Multiply 58 miles by 260 workdays in a year to get 15,800 miles, and round up to 20,000 mi/yr to include all my other trips. __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:27:25 13. Comparing the figures in (5) and (12), we see that human emission of CO2 due to respiration in 2005 was about 3.9% of the total CO2 in the atmosphere. Of course, I did not take the rest of the biosphere or the oceans into account -- this computation followed from some basic research and dimensional analysis. __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:25:31 10. Convert the figure in (9) to kg per year: (8.9e-4 kg/min)(60 min/h)(24 h/d)(365.25 d/yr) = 470 kg/yr per person. 11. Convert the figure in (10) to tons per year: (470 kg/yr)(0.001 t/kg) = 0.47 t/yr. 12. The world population in 2005 (acc. to Wiki article "human population") was about 6.5 billion, so multiply (11) by this number to get: (6.5e9)(0.47 t/yr) = 3.1e9 t/yr, or 3.1 Gt/yr __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:24:55 7. The molecular mass of a CO2 molecule is (using a periodic table): 12 g/mol + 2(16 g/mol) = 44 g/mol. 8. At standard temperature and pressure, CO2 gas has a density of 1.98 kg/m^3 (See Wiki article "Carbon dioxide"). This is equal to 1.98e-3 kg/L because 1 m^3 = 1000 L. 9. Multiply (6) by (8) to get the mass rate of CO2 emission for one person: (0.45 L/min)(1.98e-3 kg/L) = 8.9e-4 kg/min __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:24:26 5. The total amount of CO2 in the air is about 800 Gt (gigatons), or 8e11 tons. This figure comes from the Wiki article "Carbon dioxide." 6. Multiply the number in (3) by the difference of the numbers in (4) to get the volumetric rate of CO2 emission for one person: (10 L/min)(4.5e-2 -- 3.85e-4) = 0.45 L/min __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:23:31 4. The fraction of CO2 by volume in fresh air is about 385 ppm, or 0.0385%, or 3.85e-4. The fraction of CO2 by volume in the air exhaled by a human is 4.5% or 4.5e-2. Both of these figures come from the Wiki article "Carbon dioxide," under the headings "in the Earth's atmosphere" and "animal toxicity," respectively. __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:23:08 3. Multiply the numbers is (1) and (2). The result is a volumetric breath rate of (0.5 L/breath)(20 breath/min) = 10 L/min for an average adult. __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:22:28 2. According to the Wiki article "respiratory rates," the average breath rate is 20 breaths per minute for a healthy adult. (It is higher for children, so I chose the highest estimate for adults -- the lowest is 10). __________________________________________________ | |
| aurelia314159 ::: Favorites 2007-11-12 02:22:00 Here is a quick computation to investigate the question further, using the simple technique of dimensional analysis: 1. According to the Wikipedia article "lung volumes," the average volume of a normal breath, or tidal volume, is about 0.5 L/breath __________________________________________________ | |
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