This is due to much of the excitement generated about the possibilities offered by algae-based biofuels not having many numbers to back up the hype. There is much information floating around on the energy numbers produced by algae, but very little on the resources or processes required to produce it. If algae based biofuels output less energy than it takes to actually produce them, the exercise is in vain. Unfortunately, algae, in order to produce the ammount of energy and growth rates it does, needs lots and lots of both sunlight and water. You also need lots of phosphorus, an element very much needed in our agricultural industries. So it could be difficult to develop into a workable fuel without great costs.
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