How Energy From Algae Farms Can Lead to Our Next Biofuel

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Our newest sustainable and green biofuel may be right around the corner as we improve ways to draw energy from algae farms.
Our newest sustainable and green biofuel may be right around the corner as we improve ways to draw energy from algae farms.
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From author Robert B. Laughlin,
From author Robert B. Laughlin, "Powering the Future" explores the future of alternative energy and biofuels, and in the process reinvigorates the conversation about the future of energy.

The available energy sources on our planet and beyond are staggering in potential, but as Powering the Future (Basic Books, 2011) explains, the market will only move to such sources once the prices drop. From the possibilities of drawing energy from algae farms to tapping the almost limitless bounty of solar energy, renewable energy waits only for humanity to find effective means of production. Nobel Prize Winner Robert B. Laughlin describes a world in which we’ve burned every drop of petroleum and consumed every bit of coal, yet still have methods of sustaining our ways of life. In this excerpt from the chapter “Calling All Cows,” Laughlin writes of the potential for farming energy from algae farms, and the hurdles we need to overcome before it is a sustainable alternative for green biofuels.

You can purchase this book from the MOTHER EARTH NEWSstore:Powering the Future.

Drawing Energy From Algae Farms

The plants most likely to be exploited in the long term as an industrial carbon crop are saltwater microalgae. This prediction is somewhat of a stretch, because there is no saltwater agriculture industry at the moment from which you can make crop comparisons. However, microalgae grow, and thus fix carbon from the atmosphere, faster than any other plants in the world, so they’re very strong candidates. Their near-term production cost per unit mass is probably between five and ten times coal’s. This makes algae farms badly uncompetitive as an industrial carbon source while coal is plentiful but a potentially acceptable one when coal is exhausted. Other saltwater plants would have to beat this cost to win in the marketplace, and none of them can do so at the moment.

Microalgae also have an immense public relations advantage over other potential energy crops in that drawing energy from algae is quintessentially green. They’re not just natural things compatible with the environment; they’re the fundamental food source for the ocean’s entire ecosystem. These free-floating one-celled plants are visible at most ocean beaches as a green or greenish-blue tint of the light passing through the peaking surf. The powder blue color we find in open sea or in warm tropical waters indicates that the nutrients necessary for aggressive algae growth, chiefly nitrates and phosphates, are in short supply. But given a flow of nutrient-rich coastal runoff or a deep water upwelling, as we find on the Grand Banks of Newfoundland or Peru’s Humboldt Current, the water becomes turbid and green and abounds with life. Filter feeders such as shellfish, corals, and larval zooplankton eat the algae and multiply with abandon. Fish eat the filter feeders — and each other — eventually becoming abundant. Higher predators such as birds, seals, and killer whales eat the fish and likewise prosper. Commercial fishing operations thrive. The central role that algae may eventually play in the human economy when the coal runs out is thus extremely appealing, in that it echos the role they already play in the sea.

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