California has spent decades restoring wetlands in the Sacramento-San Joaquin Delta, hoping that reflooded farmland can rebuild soil, store carbon and help reduce greenhouse gas emissions. A new study published titled Interannual Variability in Greenhouse Gas Emissions Challenges Post-Restoration Net Sink Predictions in California Delta Wetlands in Global Change Biology found that the climate benefits of these projects can take longer to emerge than expected and vary substantially between sites and years.