 Pernick and Wilder explain that , in the 1970s , clean technology was considered “ alternative , ” the province of back @-@ to @-@ the @-@ land lifestyle advocates , altruistic environmentalists , and lab scientists on research grants . Such technology was in an early stage of development , was too expensive , it did not have widespread political support , and very few large , established companies were embracing the sector . Even at the start of the 21st century , the term clean tech was not yet in the financial or business community ’ s vocabulary . But now , throughout much of the world , in trends large and small , there is " the beginning of a revolution that is changing the places where we live and work , the products we manufacture and purchase , and the development plans of cities , regional governments , and nations around the globe . " 
 Pernick and Wilder explain that , in the 1970s , clean technology was considered “ alternative , ” the province of back @-@ to @-@ the @-@ land lifestyle advocates , altruistic environmentalists , and lab scientists on research grants . Such technology was in an early stage of development , was too expensive , it did not have widespread political support , and very few large , established companies <a href='uninflect' title='1'><mark>were</mark></a> embracing the sector . Even at <a href='None' title='2'><mark>the</mark></a><a href='negative_concord' title='3'><mark>start</mark></a> of the 21st century , the term clean tech <a href='negative_concord' title='4'><mark>was</mark></a> <a href='negative_concord' title='5'><mark>not</mark></a>yet in the financial or business community ’ s vocabulary . But now , throughout much of the world , in trends large and small , <a href='dey_it' title='6'><mark>there</mark></a> is " the beginning of a revolution <a href='null_relcl' title='7'><mark>that</mark></a>is changing the places where we live and work , the products we manufacture and purchase , and the development plans of cities , regional governments , and nations around the globe . " 
Pernick and Wilder explain that , in da 1970s , clean technology was considered “ alternative , ” tdaprovince of back @-@ to @-@ thda-@ land lifestyle advocates , altruistic environmentalists , and lab scientists on research grants . Such technology was in an early stage of development , was too expensive , it did not have widespread political support , and very few large , established companies was embracing the sector . Even at no start of the 21st century , the term clean tech ain't yet in the financial or bizness community ’ s vocabulary . But now , throughout much of thedarld , in trends bigass and small , it is " the dainning of a revolution is changin the places where we live and work , the products we manufacture and purchase , and the development plans of cities , regional governments , and nations around the globe . "