Fw: the world's concrete coverage
- I think ISAs include asphalt too, but anyway, I thought this might be of
interest to folks on this list-serv.
----- Original Message -----
From: "Hooker & Hooker" <hookerx2@...>
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
> 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
> 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
> 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
> 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).