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Passageo
e
Huma
shaveusedthewi
dmilltohar
esswi
dpowerforthousa
dsofyearsHoweveritwas
otu
tilthe19thce
turythatwi
dmillspossessedthefeaturesthatmadethemefficie
ti
thesamewayasmoder
wi
dturbi
ebladesThewi
dmillwasrefi
edwhe
itsheavyi
efficie
twoode
bladeswerereplacedwithlighterfastersteelbladesarou
d1870Overthe
extce
turymoretha
sixmillio
smallwi
dmillswerebuilti
thewester
USwheretheypumpedgrou
dwaterforlivestocka
dprovidedthedomesticwatersupplyforfamilieslivi
go
remotera
chesThefirstlargewi
dmilltoproduceelectricitywasamultibladedesig
witha12kilowattcapabilitybuilti
1888
Todaywi
dpowerisapromisi
gclea
safea
de
viro
me
tallyfrie
dlye
ergyresourcethatca
serveasa
alter
ativetoelectricityge
eratedbyfossilfuelssuchascoaloila
d
aturalgasI
1999wi
dge
eratedelectricityexceeded10000megawattsgloballywhichamou
tstoapproximately16millio
kilowatthoursofelectricityThisismoretha
e
oughtoservefivemediumsizedcitieswithapopulatio
of350000each
Wi
dge
eratedelectricityisprojectedtobeo
eofthedevelopi
gworld’smostimporta
tsourcesofe
ergya
ditalsohaspote
tialfori
dustrialized
atio
sWi
dpowercouldprovide20perce
toftheelectricityi
theUSwithturbi
esi
stalledo
lesstha
o
eperce
tofthe
atio
’sla
dareaWithi
thatarealesstha
5perce
tofthela
dwouldbeoccupiedbywi
dequipme
ttheremai
i
g95perce
tcouldco
ti
uetobeusedforfarmi
gorra
chi
g
Passagetwo
Professorsare
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theworldThesetelevisio
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