The Goklany report that Dyson was discussing deascribes the evidence for many of the potential negatives. I don't vouch for the quality of the report one way or

The Goklany report that Dyson was discussing deascribes the evidence for many of the potential negatives. I don't vouch for the quality of the report one way or the other but I just skim-read it and it addresses the potential costs of increased CO2 directly. edit: the report has 18 pages on the benefits and 12 pages on the costs of elevated CO2.