<span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; line-height: normal;">With the aim of replacing petroleum as an energy source, since it is an exhaustible resource, Cuba studies are underway to search for renewable sources. Specifically, the Center for Biogas and Environmental Engineering, located in Sancti Spiritus, is developing physical examinations, chemical and microbiological using forest waste, industrial, agricultural and animals.</span>
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