Subscribe: Comments for RealClimate
Preview: Comments for RealClimate

Comments for RealClimate

Climate science from climate scientists...

Last Build Date: Wed, 18 Apr 2018 08:41:49 +0000


Comment on The Silurian Hypothesis by Bill Bedford

Wed, 18 Apr 2018 08:41:49 +0000

>I think Asimov (1980) speculated that intelligence might repeatedly arise and be destroyed on a habitable planet, so that another term would be needed for the Drake equation–fraction of time an intelligent civilization actually exists during the habitable period. Intelligence may well have arisen repeatedly, but it has to be linked with the ability to manipulate the environment in order to produce technology. Dolphins may be as intelligent, and have similar communication skills, as humans but the chances of them producing a metalworking technology seem to be vanishingly slim.

Comment on The Silurian Hypothesis by SCM

Wed, 18 Apr 2018 06:55:50 +0000

I enjoyed the story very much, although I concur with Greg that a double timeline in a short story is a little confusing.

Comment on Unforced Variations: Apr 2018 by Mr. Know It All

Wed, 18 Apr 2018 06:50:47 +0000

111- Douglas Yes, technology exists to remove CO2 from the atmosphere. They've pumped into underground, turned it into "rock", etc. Don't know how much energy it would take to make a dent - but if it's not more than the output of a couple of big nuke plants, we might as well get right to it. That would be a job for governments - probably take more than rich billionaires could come up with. WOW, even the UN confirms that the Paris climate accord was of no value: 95 - Ray Here's one for you: Here are some stats for you: 98 - Kevin We can't base our society on the false beliefs of a few people; they can believe what they want, but they can't force the rest of us to affirm their beliefs and that is exactly what they are doing - see youtube video above in this comment.

Comment on The Silurian Hypothesis by Russell

Wed, 18 Apr 2018 06:24:54 +0000

I7:"wouldn’t there be fossil evidence no matter how squashed in sedimentary rocks: nuclear waste hazards, landfill linings, velociraptors with titanium hip replacements, that sort of thing?" Here you go, Roger--

Comment on The Silurian Hypothesis by jack o. lantern

Wed, 18 Apr 2018 05:20:15 +0000

As a sxity year old geologist I've spent a good part of my life looking at sedimentary, metamorphic and igneous rocks in all parts of N. America. The "past civilizations" questions is a tough one.

Comment on The Silurian Hypothesis by Jan Galkowski

Wed, 18 Apr 2018 04:39:36 +0000

Well, it won't last millions of years into the future, but, frankly, I think our longest-lived Legacies will be (a) the Carbon Dioxide we emit, and (b) our plastics. After all, in terms of our collective influence on the planet, we are Carbon Dioxide.

Comment on The Silurian Hypothesis by Night-Gaunt49

Wed, 18 Apr 2018 02:52:48 +0000

In my own fiction and past-future history it is peopled with other intelligences. Some truly fanciful (like "fairies" are Carboniferous super intelligences) to a Permian civilization that split 3 ways- one left, one stayed and the last one stayed but went into long term stasis. Based off the mammal-like reptiles as they were called. I chose the Therocephalians which are an extinct suborder of carnivorous eutheriodont therapsids that lived from the middle and late Permian into the Triassic. Therocephalians ("beast-heads") are named after their large skulls, which, along with the structure of their teeth, suggest that they were successful carnivores. Like other non-mammalian synapsids, therocephalians are described as mammal-like reptiles, although in fact, Therocephalia is the group most closely related to the cynodonts, which gave rise to the mammals. The earlier therocephalians were in many respects as primitive as the gorgonopsids, but they did show certain advanced features. The discovery of maxilloturbinal ridges in some specimens suggests that at least some therocephalians may have been warm-blooded. (And at one point they gift us an easy to build FTL drive globally.) Not counting any we create there could be more to appear some based off of elephant offshoots and even further in the future to arboreal terrestrial cephelopods onward even greater time to creatures that wouldn't look out of place in the Silurian arthropods with god-like powers. As with the answer is there intelligent life out there? When and where? Say if only 2 such appear there in our galaxy say every 15 million years are so many pitfalls involved as we have found in our own species experience. It is a matter of timing. Wouldn't have to be millions of years it could be by thousands of years and distances too great for us to ever travel at our present knowledge. We are a lowly Type 0 civilization yet our accidental wrecking of our whole climate is Type 1 level. But it is a mess and ultimately deleterious to us and all life on our planet. My hypothesis is that that a civilization can cause disaster in the next level of development. Which means the trials and tribulations of intelligence, should be mature and fix our coming Hot House Earth sooner than Nature can do there will be others for other generations to contend with. Gene Roddenberry understood the dilemma of intelligence and showed other species who also fell though they were thousands of years further in technology and intelligence. Thought experiments done as tv drama.

Comment on Stronger evidence for a weaker Atlantic overturning circulation by Killian

Wed, 18 Apr 2018 02:44:54 +0000

#63 nigelj said think in some cases the denialists know climate is not weather but deliberately promote deceit with malice and intent to spread doubt and to protect business interests. However I think with most denialists ...come to genuinely believe weather equals climate, and all the usual climate myths, because they think AGW is a giant liberal conspiracy... You seem to be, imo, conflating climate denial pawns or dupes, your typical Trump voter, e.g., and active denialist activists, often paid.

Comment on Unforced Variations: Apr 2018 by nigelj

Wed, 18 Apr 2018 01:59:23 +0000

Douglas @111, not a climate scientist but I have done some reading about this recently. My understanding is carbon capture and storage is proven technology applied to coal fired power or direct atmospheric capture and burying the emissions. The trouble is its expensive (although not prohibitively). Its not going to happen until theres a realistic price on carbon or state subsidies. It's not an approach that enthuses me, as it might tend to encourage keeping coal fired power. The natural ways of carbon capture and storage is using farming systems that encourage soil carbon. This requires investment and different methods of farming and theres a current lack of farmers sufficiently motivated, and a lack of financial incentives for changing farming systems. There are some pilot schemes around that get subsidies, and it doesnt need huge subsidies. Its a question of political and individual will. It looks cost effective. All these natural systems of modified farming can draw down a lot of CO2 given enough scaling up and enough time for the process to work, which takes significant time.The other benefit is modifying farming systems does not require new land, so its just about use of biochar, compost, no till farming etcetera. And there is planting forests of course, but again this needs incentives and land. However it has significant potential to sequester carbon. BECCS is another system that uses fast growing trees to be burned for electricity generation, and emissions stored underground in old oil wells, and deep permeable rock formations, but this needs gigantic areas of land, irrigation and fertiliser and expensive, energy intensive processes. Its plausible in theory, but a pilot scheme was abandoned because of problems so not looking promising. The huge scale and land and resources required has massive challenges and its own set of environmental impacts that could be negative. I do recall seeing that BECCS could draw down 30% of emissions, but needs land the size of two Indias! Sorry I dont have time for internet references, and these things are reasonably easy to google.

Comment on Alsup asks for answers by Hank Roberts

Wed, 18 Apr 2018 01:22:01 +0000

> ... alarmist ...? Even smart people. You can look this stuff up. Climate Feedback rates claims, for example this one: