Key developments
Agulhas eddies cool shelf seas and raise stratification
Nature Climate Change published a two-year mooring study by K.L. Gunn and L.M. Beal across the Agulhas Current at 34° S, showing that eddy activity shifts heat and salt toward the current core while exporting heat from the inshore shelf. In the linear state, submesoscale frontal eddies drive upwelling of cold, nutrient-rich water and mixing; during meanders, larger disturbances alter jet curvature and strengthen stratification offshore. Phys.org reported the same findings and said the authors link the pattern to rapid surface warming in the Agulhas and possible relevance to other western boundary currents.
Why it matters
It identifies a mechanism by which intensifying eddies can change coastal warming, stratification, and nutrient delivery in major ocean currents.
Sources & driving stories
NATURE CLIMATE CHANGE · K.L. Gunn, L.M. Beal
Nature Climate Change coveragePHYS
Phys coverageCalifornia revises cap-and-invest to cushion costs
The Mercury News reported that the California Air Resources Board has revised proposed updates to the state's Cap-and-Invest program amid economic uncertainty and volatile carbon-market conditions. The latest plan would double a manufacturer incentive fund to $4 billion, add about $800 million in compliance support through 2030 to limit gasoline-price impacts, and remove allowance allocations beyond 2030 while keeping emissions caps in place through 2045.
Why it matters
California's carbon market is a major climate policy lever, and these changes affect both emissions enforcement and near-term industrial costs.
Sources & driving stories
THE MERCURY NEWS · Rob Nikolewski
The Mercury News coverageGeorgia Power approves customer-built clean energy program
Grist reported that Georgia Power's newly approved Customer-Identified Resource program will open in summer after receiving approval from state public service commissioners. The program lets customers propose and finance clean energy projects connected to Georgia Power's system, including direct development by companies with emissions-reduction targets or funding for projects not selected in the utility's regular bid process.
Why it matters
It creates a new route for large customers to finance clean power and could reduce pressure for additional gas generation.
Sources & driving stories
GRIST · Emily Jones
Grist coverageWorth noting
WORTH NOTING
EDF launches climate-cost maps
The new maps tie climate change to family costs, water stress, and disaster losses while arguing that EPA rollbacks would increase pollution and expenses.
WORTH NOTING
Puerto Rico solar aid faces restoration push
Nearly 200 organizations are urging restoration of $350 million for rooftop solar and batteries for 12,000 low-income households before hurricane season.
WORTH NOTING
U.S. climate concern stays elevated
Gallup's latest polling says concern about climate change remains near a high point, with persistent partisan gaps on the seriousness of the problem.
Still unclear
OPEN QUESTION
Will California's revised cap-and-invest still hit targets?
CARB is adding flexibility and cost support, but the revised design still needs to deliver the state's 2030 and 2045 emissions goals.
OPEN QUESTION
Do other western boundary currents show the same eddy effect?
The Agulhas result could point to a broader climate-driven shift in shelf-sea heat transport, but evidence from systems like the Gulf Stream remains limited.