|
Post by edireland on Nov 16, 2012 18:37:26 GMT 9.5
Also the yields of crops at that time would be so low that they would never be insolation limited.
They are far more likely to be now that they are not likely to be nutrient limited, atleast in the west.
|
|
|
Post by Nuclear on Nov 16, 2012 21:30:34 GMT 9.5
Hi eclipse, my point was to show that it's possible to grow food crops at high latiudes if the temperature and soil conditions are right. Solar insolation is a factor too, but it doesn't seem overly significant. Of course plants need light, the question is how much. Yields are not only limited by external factors such as insolation or nutrient availibility, but plant physiology itself. Perhaps genetic engineering will allow us to design crops perfectly adapted to near-polar summers? This map shows us that some of the world's highest grain yields are reached in cloudy Britain and Denmark. Thanks to the balmy European climate we tend to forget that Britain and Denmark lie at the same latitude as the Canadian subarctic, a region which could become a major grain producer once it gets warmer!
|
|
|
Post by Nuclear on Nov 16, 2012 21:32:23 GMT 9.5
Sorry for those huge maps.
I think a major problem will be India. Desertification on the Indian subcontinent would be an unimaginable humanitarian disaster!
|
|
|
Post by David B. Benson on Nov 17, 2012 14:35:04 GMT 9.5
|
|
|
Post by Nuclear on Nov 17, 2012 18:44:30 GMT 9.5
The reason has to be permafrost.
|
|
|
Post by David B. Benson on Nov 18, 2012 8:52:59 GMT 9.5
No, the Canadian shield is mostly bare rock; almost no soil.
|
|
|
Post by Nuclear on Nov 18, 2012 21:20:23 GMT 9.5
I see. Then future crop expansion would likely stick to the interior plains ... if they thaw up that is ... ?
|
|
|
Post by David B. Benson on Nov 19, 2012 9:14:48 GMT 9.5
Nuclear --- Yup.
|
|
|
Post by eclipse on Nov 21, 2012 12:28:07 GMT 9.5
|
|
|
Post by David B. Benson on Nov 21, 2012 15:35:06 GMT 9.5
|
|
|
Post by David B. Benson on Jan 1, 2013 12:45:09 GMT 9.5
|
|
|
Post by Roger Clifton on Jan 1, 2013 20:22:49 GMT 9.5
DBB @ today - thanks for the link. It sketches some of the disasters looming and the horror of a public too complacent to react.
I wonder whether the willful ignorance of the public is because the timescale between prediction and event is that to which we traditionally ascribe Acts of God.
For example, property speculators can gamble comfortably on the expectation that any climatic disaster - even if long predicted - can be ascribed to an Act of God and therefore the government can be bullied into paying for its effects. Similarly the elected government may consider that preparing for future Acts of God is the responsibility of future governments.
The city of Brisbane, Australia is built on a floodplain. When a particularly severe flood (2011) damaged a large number of properties, the owners/speculators were able to shout down suggestions that climate change is worsening their risk. God does it, so the government gotta cough up.
Of course the owners of property and infrastructure should take responsibility for preparing for events that are predicted decades in advance. Perhaps it is that denial of responsibility that is at the heart of the climate denial movement.
|
|
|
Post by Roger Clifton on Feb 2, 2013 19:30:28 GMT 9.5
Current images from the east Australian floods bring to mind the question, how well will our future power supply lines survive the consequences of climate change?
In floods, underground powerlines must surely get washed away. Increased peak wind speeds in hurricanes would bring down overhead power lines.
Plans for decarbonisation lend heavily on the expansion of our electricity grid. It would be ironic if our preparations for averting climate change were not themselves climate change proof.
If generation of power were distributed throughout the grid, its interconnectivity would be less critical. That should be an argument for wind or solar, but it would require major energy storage, which is so far mythical.
|
|
|
Post by edireland on Feb 2, 2013 20:25:36 GMT 9.5
Overhead power lines can be replaced in days. (That is one of the advantages of them).
And most flooding conditions, such as those recently experienced in the United Kingdom, do not do significant damage to sealed underground power cables, only doing damage via water ingress at manholes et al.
Polymer type HVDC "Light" Cables would enable large scale power distribution even in waterlogged conditions with no risk of oil leakage or similar problems.
|
|
|
Post by anonposter on Feb 2, 2013 22:09:35 GMT 9.5
Distributing power throughout the grid like is proposed by the windbags just means that you'd have to do a lot more work to restore power if the lines across an entire area got taken down.
|
|
|
Post by Roger Clifton on Feb 3, 2013 11:57:55 GMT 9.5
Other readers may be interested in the flood resistant (and probably termite resistant) trunk powerlines that edireland refers to : specs for HVDC (light) cable... and heavier forms of HVDC at various installations around the world.
|
|
|
Post by edireland on Feb 5, 2013 23:08:30 GMT 9.5
Your link for HVDC Light cables appears to be broken: try thisNote: you apparently don't put quote marks around the URL.... this board software is very odd... I normally use invisionfree or derivatives thereof.
|
|
|
Post by moguitar7 on Feb 17, 2013 4:31:31 GMT 9.5
What does this have to do with the topic?? Nothing!!!
|
|
|
Post by BNC Moderator on Feb 18, 2013 14:58:06 GMT 9.5
Moguitar is correct. This has drifted way off topic. If you wish to continue the electrical discussion please start an appropriately headed new thread.
|
|
|
Post by Infarction on Aug 7, 2015 23:18:19 GMT 9.5
How far do we have to go over planetary boundaries blinded by greed, ideology and ignorance before those who can initiate emergency action recognize the emergency? What will it take to persuade governments of the urgency of the climate change crisis and to take unilateral action rid the world of fossil fuels? There is a petition at www.thepetitionsite.com/529/246/535/demand-the-paris-summit-agrees-to-cap-fossil-fuel-extraction/ summary being "If fossil fuels come out of the ground they will be burnt contributing to the CO2 concentrations in our atmosphere. The Paris Summit can debate this truth and should agree to a global cap with annual reductions in allowable extractable CO2 potential tonnage." Please sign and share this petition.
|
|
|
Post by eclipse on Sept 24, 2015 12:23:36 GMT 9.5
Hi all, anyone here been following this Arctic News group? They're real, peer-reviewed climate scientists that are freaked out about a new understanding of the 'methane bomb' hiding off the Arctic. It's very scary stuff that seems misunderstood by other more mainstream climatologists. Have a look at their major summary papers down the side of the blog and let me know what you think. arctic-news.blogspot.com.au/
|
|
|
Post by eclipse on Oct 20, 2015 10:19:26 GMT 9.5
|
|
|
Post by huon on Jul 12, 2019 15:42:19 GMT 9.5
|
|
|
Post by David B. Benson on Jul 25, 2019 19:32:58 GMT 9.5
|
|
|
Post by David B. Benson on Jul 25, 2019 20:02:28 GMT 9.5
|
|
|
Post by David B. Benson on Jul 25, 2019 22:03:59 GMT 9.5
|
|
|
Post by Roger Clifton on Jul 26, 2019 17:23:08 GMT 9.5
World's population is projected ... has clearly failed to take global warming into account. Tell us more. What do you predict?
|
|
|
Post by David B. Benson on Jul 26, 2019 17:48:35 GMT 9.5
Roger Clifton --- look at the article just above about the Climate Demography Vulnerability Index. As I understand it, Africa becomes uninhabitable and the regions colored yellow, such as South Asia, hardly better. So I can easily imagine catastrophe as those peoples attempt to escape the heat. Not to mention that it will be too hot to grow crops.
I don't have better data from which to prophesy.
|
|
|
Post by Roger Clifton on Jul 27, 2019 9:53:08 GMT 9.5
Climate Demography Vulnerability Index: See the map to discover that Africa is the most severely affected. To make sense of the map, could we have a definition for Climate Demography Vulnerability Index, please.
|
|
|
Post by David B. Benson on Jul 27, 2019 10:55:18 GMT 9.5
Roger Clifton, go back to the link which introduced the CDVI.
|
|