<a href="http://pakedu.net/?attachment_id=60100" rel="attachment wp-att-60100"><img class="alignleft size-full wp-image-60100" alt="Small biogas plants reducing dependence on firewood" src="http://pakedu.net/wp-content/uploads/2012/12/Small-biogas-plants-reducing-dependence-on-firewood.jpg" width="230" height="200" /></a>Karachi
Small raw-built biogas units are proving to be the best
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