Carbon-trading software company CarbonFlow has added a $1 million follow-on to its first round of $2.9 million, which it first announced in July. The extra investment was provided by @Ventures.

CarbonFlow’s trading software is designed to comply with the carbon standards set by the Kyoto Protocol, although it also includes national standards. Users, typically corporations, can track, buy or sell carbon credits with the system.

The company was founded in 2006 by Neal Dikeman, a green tech journalist from CNET. CarbonFlow later partnered with Det Norske Veritas, a major European verifier of greenhouse gas projects.

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