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Fw: the world's concrete coverage

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  • Mike Morin
    I think ISAs include asphalt too, but anyway, I thought this might be of interest to folks on this list-serv. Mike ... From: Hooker & Hooker
    Message 1 of 1 , Jul 14, 2004
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      I think ISAs include asphalt too, but anyway, I thought this might be of
      interest to folks on this list-serv.

      Mike

      ----- Original Message -----
      From: "Hooker & Hooker" <hookerx2@...>
      To: <CNU@...>
      Sent: Wednesday, July 14, 2004 7:36 PM
      Subject: FW: the world's concrete coverage


      > Factoids to work with.
      >
      > John H.
      >
      > -----Original Message-----
      > From: Brendon Slotterback [mailto:bslotterback@...]
      > Sent: Wednesday, July 14, 2004 3:31 PM
      >
      > From the BBC News - UK Edition:
      >
      >
      > US concrete 'would cover Ohio'
      >
      > Excessive concrete cover is not good for the environment
      >
      > If all the concrete structures in America's 48 contiguous states were
      added
      > up, they would cover a space almost as big as Ohio, researchers say.
      >
      > Workers from several universities and agencies have put together the first
      > ever map of the US, which shows "impervious surface areas" (ISA).
      >
      > It is important to tot up concrete cover because of its harmful effect on
      > the environment, the researchers claim.
      >
      > The work was led by the National Oceanic and Atmospheric Administration.
      >
      > Giant Jigsaw
      >
      > If you made a giant jigsaw out of all the highways, streets, buildings,
      > parking lots and other solid structures in the contiguous states, it would
      > cover 112,610 sq km (43,480 sq miles). That is an area nearly the size of
      > Ohio, which is 116,534 sq km (44,994 sq miles).
      >
      > This is far more than a Christmas cracker statistic, the researchers
      claim,
      > because concrete cover - or ISA - is not good for the environment.
      >
      > The replacement of heavily vegetated areas by ISA reduces the depletion of
      > carbon dioxide, which plants absorb from the atmosphere. This can speed up
      > global warming.
      >
      > ISAs can also alter the water cycle and disrupt aquatic ecosystems. They
      do
      > this by changing the shape of stream channels, raising water temperatures
      > and washing pollutants into aquatic environments.
      >
      > Population growth
      >
      > The ISA of the contiguous states is already slightly larger than that of
      its
      > wetlands, which cover 98,460 sq km (38,020 sq miles).
      >
      > The population of the US is increasing by three million a year. Concrete
      > cover is spreading to match.
      >
      > Every year, one million new family homes are built and 20,000 km (10,000
      > miles) of roads are laid.
      >
      > Given these trends, it is likely a lot more will be made of impervious
      > surface areas in the future.
      >
      > The research was part funded by the US space agency (Nasa).
      >
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