Environment-Clean-Generations

Environment-Clean-Generations
THE DEFINITIVE BLOG FOR EVERYTHING YOU NEED TO KNOW ABOUT THE ENVIRONMENT YOU LIVE IN, WITH REFERENCE TO LIFE, EARTH AND COSMIC SPACE SCIENCES, PRESENTED BY ENVIRONMENTAL ENGINEER DORU INDREI, ENVIRONMENTAL QUALITY AND ENERGY SPACIALIST
"Life is not about what we know, but what we don't know, craving the unthinkable makes it so amazing, that is worth dying for." Doru Indrei
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Showing posts with label civilizations. Show all posts
Showing posts with label civilizations. Show all posts

The Urban Future



Architect Mitchell Joachim points out, frequently and without prompting, that his futuristic proposals are always based on existing technologies. No wonder he feels the need to say it. Consider some of his ideas: jetpacks tethered together in swarms, houses grown from living trees, low-altitude blimps prowling New York City with chairs hanging below them for pedestrians to hop on and off (24/7 ski lifts on Broadway!), and WALL-E-like machines that erect buildings and bridges from recycled waste. 


For Joachim, a 39-year-old professor of architecture at New York University, with graduate degrees from MIT, Harvard and Columbia, these concepts aren’t Hollywood fluff but designs that could come to life today. Take his concept for waste-building machines, which he calls Rapid Re(f)use. Instead of the cubes of cardboard, plastic or steel that current recycling balers produce, Joachim’s robots would grind and compress waste into I-beams, cruciform columns or even furniture components. The structures would be pressed or melted into shape or wrapped with metal bands, which is what recycling plants do now. All that would change is the shape—like switching the mold on a Play-Doh press, but on an industrial scale. “We could do it yesterday,” Joachim insists.


His vision falls under the banner of Terreform ONE, a nonprofit design collective that Joachim co-founded to explore sustainable, fully integrated urban planning. If the same people who design the roads also design the cars, he says, and the same people who create the suburbs also plan for ways to feed and transport residents, our cities will become healthier, friendlier and more sustainable.


The group imagines how future cities might best serve their citizens on a large scale and then experiments with the small-scale materials and designs that it would take to make it happen. To this end, Terreform ONE hosts TerreFarm, an annual summer gathering of architects and scientists who develop new urban farming techniques. 

For several weeks this summer, TerreFarm will convert a Brooklyn rooftop into a testbed for modular growing methods, designs for maximizing available sunlight, and ultra-lightweight soil mixes essential for rooftop gardens. They will also build full wall sections of Joachim’s Fab Tree Hab, his proposal to create “living” homes by grafting trees together around scaffolds and growing them on-site.


Joachim’s other plans tend to focus on mobility, since transportation both shapes and is shaped by urban design. In his vision, individual cars would be replaced by car-share systems that function like luggage carts at an airport. Pay, step into a smart car that communicates with the city grid, drive to your destination, and leave the car there. The cars would have soft, springy exteriors, inflatable protective bladders and transparent foil, which would enable them to bump together as they traveled in flocks.

“The idea of sharp metal boxes is just done,” Joachim says. “We design cars with the principle that no one would ever die in a car accident again.”


Joachim’s blimps would move like trolley cars. Their routes would be set by funicular cables, and they would float slowly enough that pedestrians would be able to hop on and off hanging chairs dangling above the ground. Unlike a trolley car, though, the blimps would also be able to cross rivers, gorges and other geographic features without bridges.


His jetpack designs are not the retro-futuristic rocket belts of the 1960s but more like the lightweight ducted-fan jetpacks scheduled to go on sale later this year from Martin Aircraft Company. For efficient commuting, Joachim’s jetpacks—soft and flexible like his cars—would be towed in flocks by a plane or blimp. “Bump and glide,” as Joachim describes it. From there, individuals could break off, power up, and fly safely to their homes or offices—like subways in the sky. “It’s hard to find people who don’t want to be moving around in jetpacks in 20 years,” he says. “As an architect, then, I’m responsible for thinking about what the implication of the jetpack is on the future city.”

Joachim’s willingness to forgo lucrative commercial projects in favor of running a nonprofit dedicated to the reimagining of a future he won’t even be around for is, say his colleagues, exactly what makes him so vital. Traditionally, “cities are built incrementally by real-estate interests,” says Richard Sommer, the dean of architecture at the University of Toronto. “What’s important about Mitchell’s work is that he [takes] a visionary approach.”


The vision part involves looking 150 years down the road and planning for how cities will have to operate within the environment if civilization is to endure. Even if the technologies exist today, Joachim says, no one can change the city tomorrow. “Once we heard about cellphones, it was about seven years before we started dropping the landline,” he says. “It took about 15 years before you could buy a hybrid car on every lot. It takes around 40 years to produce a large shift in the way buildings are constructed. Entire cities? It’s 100, 150 years.”


In the meantime, Joachim is busy producing the stuff that will get us there, whether it’s growing living walls, planting organic lettuce on urban rooftops, or making sure that when your grandkids are ready for their first jetpacks, their cities will be too.

by "environment clean generations"

Search for Extraterrestrial Civilizations



Good things come to those who wait, and wait, ... and wait. This may someday be the opening sentence at a press conference at the SETI Institute in Mountain View, California to announce mankind's first evidence of intelligent life off the Earth. 

           We've listened for transmissions from alien civilizations for 50 years without any luck. And there isn't the slightest clue when real data -– if ever -– may come. This bores some scientists who scornfully look at SETI as lost purely in "hypothetical-space."

           Detractors say (1) nobody's out there, (2) we're listening on the wrong medium, (3) it's a scientifically meaningless experiment unsupported by any tangible hypothesis because of all the unknowns (as listed in the famous Drake equation). It's borderline pure faith.

           However, there's no need for impatience with a null result. We've just ended a year of celebration honoring the 400th anniversary of Galileo's first use of the telescope for astronomical research. Galileo provided the first observational evidence in support of the Copernican Principle -– that we do not occupy a special place in the universe.

           Following Galileo, it took no less than a century to make each step outwards into the cosmos.
The earliest telescopic observations from the 1600s through the 1700s focused largely on the solar system. In the 1800's astronomers characterized stars with the powerful new tool of spectroscopy. True, telescopes of that time resolved spiral nebulae (external galaxies) but they were widely considered simply accretion disks around stars. 


External galaxies were not recognized until a little less than a century ago, once their enormous distances could be measured. This month's Hubble Space Telescope portrait of a field of galaxies stretching almost all the way back to the beginning of time was the crowning achievement of "core-sampling" the universe. 

              The 21st century will carry us to the realization of a "second Genesis," the discovery of life arising elsewhere in space. But intelligent life too?
              In an article in the Washington Post last week Marc Kaufman reported that, with the influence of former NASA Associate Administrator Alan Stern (also the principal investigator on the New Horizons 2015 Pluto flyby), NASA is reconsidering funding SETI proposals and Congress isn't saying "no." The National Science Foundation has been funding SETI research since 2004. 
  
              It was a dark day for SETI in 1993 when Congress cut off a very modest funding for radio searches ($12 million/yr.) thereby extending isolationism across interstellar space. They disconnected the phone on a targeted search of 1,000 nearest sun-like stars and a multi-million radio frequency all-sky survey.

             Leading the attack was former Nevada Democratic Senator Richard Bryan who found a great taxpayer whipping boy in the SETI goals. He milked the patently un-scientific UFO phenomenon to belittle SETI as having any intellectual ballast. "The Great Martian Chase may finally come to an end. As of today, millions have been spent and we have yet to bag a single little green fellow," he said in 1993. Other senators questioned the use of taxpayer dollars and cited the skepticism that confronts SETI research.

             Since then SETI astronomers have scrambled to raise money through private donations. The powerful new $25 million Allen Array (pictured top), an orchard of interlinked and mass-produced radio telescopes in northern California, was funded by Microsoft co-founder Paul Allen. Now I guess that means that if we get a SETI signal the first to know may be Microsoft founder Bill Gates instead of President Obama.


             Greek philosophers spoke eloquently of an infinite universe full of life, but only until recently scientists have treated the question with deep skepticism. A half century ago life was considered so fragile that the circumstances that brought it on Earth were considered at best quite rare. Today we know that life is tenacious, opportunistic, and will eat almost anything in carving out an environmental niche. Evolution is the most awesome manifestation of matter. 

             What's more, NASA's Kepler mission will likely tell us there are millions of inhabitable planets like Earth across the galaxy.
Still, intelligent life may indeed be exceedingly rare. But, armed with powerful new telescopes and technology, if anybody is out there, we should find them in the next 25 years predicts the founder of SETI, Frank Drake. Drake had the scientific courage to listen for aliens 50 years ago when the idea was definitely un-cool in science circles.

             My guess is that if intelligent life is common, then its detection -- probably purely by accident -- will happen before scientists celebrate Galileo’s 500th anniversary. The Copernican revolution will be truly completed.


by "environment clean generations"

Drake Equation


         
               The Drake equation is closely related to the Fermi paradox in that Drake suggested that a large number of extraterrestrial civilizations would form, but that the lack of evidence of such civilizations (the Fermi paradox) suggests that technological civilizations tend to disappear rather quickly. This theory often stimulates an interest in identifying and publicizing ways in which humanity could destroy itself, and then counters with hopes of avoiding such destruction and eventually becoming a space-faring species. 

             A similar argument is The Great Filter, which notes that since there are no observed extraterrestrial civilizations, despite the vast number of stars, then some step in the process must be acting as a filter to reduce the final value. According to this view, either it is very hard for intelligent life to arise, or the lifetime of such civilizations must be relatively short.

            

The equation

The Drake equation states that:

 

where:

N = the number of civilizations in our galaxy with which communication might be possible; 
and
R* = the average rate of star formation per year in our galaxy
fp = the fraction of those stars that have planets
ne = the average number of planets that can potentially support life per star that has planets
f = the fraction of the above that actually go on to develop life at some point
fi = the fraction of the above that actually go on to develop intelligent life
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = the length of time for which such civilizations release detectable signals into space.[3]

 Alternative expression

The number of stars in the galaxy now, N*, is related to the star formation rate R* by
 
 

where Tg = the age of the galaxy. Assuming for simplicity that R* is constant, then   and the Drake equation can be rewritten into an alternate form phrased in terms of the more easily observable value, N*.

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