Three studies published this week examine some of the issues of negative emissions in detail. The first focuses primarily on BECCS—bioenergy with carbon capture and storage. This is a technically attractive strategy that would involve growing biofuel crops, burning them to generate electricity, capturing the CO2 leaving the power plant’s exhaust, and storing that CO2 somewhere (probably deep underground). The added value from electricity generation makes this look cheaper than many methods that could pull similar amounts of CO2 out of the air. As a result, many emissions scenarios that manage to halt warming at 1.5°C or 2°C rely on sizable deployments of BECCS to get there.
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