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Microsoft recently announced that it aims to become carbon negative by 2030. What’s more, the company said that by 2050, it plans to have removed from the atmosphere all the carbon that it has emitted since it was founded in 1975. This is a significant commitment from an individual company, and it underscores the potential for approaches using negative emissions, or carbon dioxide removal, to play an important role in meeting international climate goals. Carbon neutrality, or “net zero,” means that any CO 2 released into the atmosphere from human activity is balanced by an equivalent amount being removed. Becoming carbon negative requires a company, sector or country to remove more CO 2 from the atmosphere than it emits. Meeting ambitious international climate goals may require global CO 2 emissions to fall below zero in the second half of this century, achieving what is known as net negative …