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The first refinery, which opened in 1861, produced kerosene by simple atmospheric distillation. Its by-products included tar and naphtha. It was soon discovered that high-quality lubricating oils could be produced by distilling petroleum under vacuum. However, for the next 30 years, kerosene was the product consumers wanted most.

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Biogas is a relatively high-value fuel that is formed during anaerobic degradation of organic matter. The process has been known, and put to work in a number of different applications during the past 30 years, for rural needs such as in[73]: food security, water supply, health cares, education and communications.

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energy source derived directly from organic matter, such as plants. living organisms, and the energy contained within them. renewable energy derived from living or recently living organisms, mostly plants. crop, residue, and other organic material that can be used to produce energy on an industrial scale.

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The aim of this paper is to review the performance trends of different wave energy converters during the past 30 years. Thirty years ago, it was the time when the first set of 'successful' WECs started coming up. This paper reviews the proposed concepts that have reached the design stage and have been deemed feasible.

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The number of leaves in an oil palm plant increase from 30 to 40 in a year at the age of 5 to 6 years. After that, the generation of leaves decreases to about 20 to 25 per year [ 9 ]. The average economic life-span of the oil palm is 25 years to 30 years [ 10 ].

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