American Association for the Advancement of Science

Kotchen et al. find that the greenhouse gas mitigation potential identified by the IPCC in its latest assessment report is larger and cheaper than what is found in widely used integrated assessment models, like DICE, FUND, and PAGE. They suggest that the discrepancy between the various curves could be resolved by excluding the What worries us most...

Effective policies to halt biodiversity loss require knowing which anthropogenic drivers are the most important direct causes. Whereas previous knowledge has been limited in scope and rigor, here we statistically synthesize empirical comparisons of recent driver impacts found through a wide-ranging review. We show that land/sea use change has been...