College of Engineering News • Iowa State University

A carbon-negative economy: A practical prospect or a pipe dream?

“Let’s not simply reduce the CO2 emissions going up into the atmosphere. Let’s draw them down.”

So says Robert Brown, a professor of engineering at Iowa State University and a leader of the university’s Initiative for a Carbon Negative Economy and its Bioeconomy Institute. Those are interdisciplinary campus efforts to develop ways to remove carbon dioxide from the atmosphere by growing plants or algae, making them into fuels and burying their carbon residues in soil — and make money doing it.

The notion that we can generate wealth and remove CO2 from the air is obviously appealing. As atmospheric concentrations of CO2 rise and climate risks grow, so does the need for carbon-negative technologies that pull CO2 from the air, as plants do, and then store it underground or deep in the ocean.

But is this practical or a pipe dream? That’s what Brown and his colleagues at Iowa State and its Bioeconomy Institute want to find out, as they explained this week at a two-day workshop on biochar — that’s the term used for the charcoal created when biomass is decomposed at high heat, in a process called pyrolysis. The workshop was part of the Carbon War Room‘s Creating Climate Wealth Summit in Washington, D.C..

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