A teak plantation in Palenque, Chiapas. The trees were planted years before South Pole helped a forestry firm claim carbon offsets.

A teak plantation in Palenque, Chiapas. The trees were planted years before South Pole helped a forestry firm claim carbon offsets.

Photographer: César Rodríguez for Bloomberg Green
ESG & Investing

Faulty Credits Tarnish Billion-Dollar Carbon Offset Seller

South Pole, the world’s leading purveyor of offsets, is facing allegations that it exaggerated climate claims around its forest-protection projects. The uncertainty could influence how legions of companies try to slash their emissions.

Renat Heuberger gathered his co-founders on a glacier in the Swiss Alps for a celebration. The half-dozen men behind South Pole, the world’s leading seller of carbon offsets, raised their beers around a crackling fire: Business was booming and the Zurich firm’s valuation was hurtling toward $1 billion, making it one of the first “carbon unicorns.”

But the claims underpinning South Pole’s success have been losing ground like the ice underfoot that day two summers ago. The company’s biggest moneymaker is a mega-project in Zimbabwe called Kariba, which South Pole claimed has prevented the annihilation of a forest nearly the size of Puerto Rico. That’s South Pole’s business model: help finance projects that can credibly counteract rising levels of greenhouse gas, such as by stopping deforestation, and then sell the resulting credit to corporate clients who want to compensate for their own planet-warming pollution.