Revision as of 16:09, 2 October 2015

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There's plenty of building material in the atmosphere. SVG
(variable atmospheric humidity omitted)

Two motivations must be seperated:

• greenhouse gas reduction
• carbon extraction for productive use

Devices for the removal of CO₂ from the atmosphere do not need and probably should not be able to do self replication. Making such devices macroscopic seems to be a better alternative than making them in the micro- to nanoscale. It makes handling them easier (even collectible by hand) allows for more control and less environmental spill.

Locating solar cells for CO₂ recuperation sparsely distributed in the air or on the sea instead of placing them concentrated in one place on the ground may be good for environmental (no pave-over) and political reasons.

• Carbon extraction must stop at a certain level - otherwise all plants on earth may be in severe danger.
• Every conscientiously designed mobile (airborne/seaborne) device must care about its fate after their end of service.

Sub-classes:

• mobile carbon dioxide collector

Water (seaborne)

Concept art of buoy for collection of atmospheric CO₂. SVG - Carbon dioxide collector units

Seaborne air processing ships of a size that is easy to handle like mobile carbon dioxide collector buoys have the potential to fulfill the global energy needs and remove the the excess CO₂ that had accumulated due to burning of fossil fuels along with other unwanted gasses of industrial origin.

Swimming units have the benefit of easier access to wind power and easier propulsion. They can easily be kept stationary.

older text

For swimming ones - micro ships - essentially the same reasoning applies. They need only plain air as lifting medium must be sturdier can use the wind for propulsion and are easier to collect manually (skimming) if something goes wrong.

Air (airborne)

Micro airships:

• have a very lightweight bubble as main body in a size range between 10um and 100.000um
• use depending on size thermal heating or hydrogen for lift
• use their surface for harvesting of solar energy
• are capable of water capture and splitting for compensation of hydrogen diffusion loss
• may be capable of carbon dioxide capture and splitting
• may be capable of self replication
• may (if malicious) create some nasty gasses

Land (more or less stationary)

• Nanofactories that use air directly as building material.
• devices looking slightly akin to trees
• placement in inhabited areas - environmental issues!
• ... ?

Questions

• packing and shipping CO₂ or preprocessing it right away?

To investigate: If replicative how fast could they replicate (doubling time) depending on their diameter?
What is the limiting factor: solar-power for hydrogen generation, diluteness of CO₂ or something else?

To investigate: Can they be made to actively propel themselves? Their high volume to mass ratio makes this rather difficult when there's even the slightest bit of wind. Flattening the bubbles drops the aerodynamic resistance significantly.

To investigate: AP manufactured solar cells & mechanosynthetic carbon dioxide splitting

Extraterrestrial application

• usage in Gas giant atmospheres
• usage on Venus

Related

• Josh Hall's high altitude mirror bubble concept (not necessarily handling atmospheric gasses) [todo: add video link]
• Mobile mesoscale robotic devices "nanobots"
• Mobile nanoscale robotic devices "microbots"
• atmosphere sentinels

External Links

• Diamond Trees (Tropostats): A Molecular Manufacturing Based System for Compositional Atmospheric Homeostasis - 2010 Robert A. Freitas Jr. pdf

[todo: split off makro and self replicating aspect from this page - distribute to sub-pages of Mobile robotic device ] [todo: tackle size and mobility decisions ] - done?