Analysis of 25 years of evidence shows most schemes are poor quality and fail to lower emissions Analysis of 25 years of evidence shows most schemes are poor quality and fail to lower emissions The failure of carbon offsets to cut planet-heating pollution is “not due to a few bad apples”, a review paper has found, but down to deep-seated systemic problems that incremental change will not solve. Research over two decades has found “intractable” problems that have made carbon credits in most big