Microbial Catalysis for CO₂ Sequestration: A Geobiological Approach

Area of Science:

• Environmental Science
• Biotechnology
• Geochemistry

Background:

• Rising greenhouse gas levels, primarily carbon dioxide (CO2), pose a significant threat to global climate stability.
• Natural carbon dioxide removal (CDR) processes, like silicate and carbonate cycles, operate too slowly to mitigate current climate change impacts.
• Accelerated CO2 drawdown is crucial to avoid catastrophic global warming effects, including biodiversity loss and climate migration.

Purpose of the Study:

• To explore the potential of using microbes to significantly accelerate carbon dioxide removal (CDR).
• To investigate microbial enhancement of silicate weathering as a sustainable CO2 drawdown strategy.
• To assess the feasibility of producing valuable by-products during microbial carbon sequestration.

Main Methods:

• Reviewing and discussing various microbial approaches to enhance silicate weathering rates.
• Utilizing olivine, a silicate mineral, as a case study due to its favorable weathering properties and abundance.
• Drawing parallels with industrial microbial processes to evaluate scalability for carbon dioxide removal.

Main Results:

• Microbial enhancement of silicate weathering could potentially accelerate CO2 drawdown by orders of magnitude compared to natural processes.
• The process offers a dual benefit of carbon dioxide removal and the biosynthesis of valuable materials.
• Olivine is a promising candidate mineral for microbial-assisted carbon sequestration.

Conclusions:

• Microbial intervention presents a viable strategy to significantly enhance the rate of silicate weathering for carbon dioxide removal.
• Further research is essential to determine the maximum rate of silicate dissolution and the economic scalability of this CDR approach.
• Achieving industrial-scale microbial carbon sequestration is feasible, mirroring successes in other biotechnology applications.