For pure economics, UChicago would be the choice academically, but given the interest in environmental policy as well, that brings Brown and Dartmouth much closer in. However, I think the real differentiator is in quality of life and stress - you’ll fare best at Brown, then Dartmouth, and lastly Chicago/Berkeley. Also the undergrad focus at Brown and Dartmouth are real nice touches. Overall I think Brown gets the edge unless there is a better feel at Dartmouth or Chicago, with Berkeley being a distant fourth. But Brown is known to be quite happy so I’d be surprised if other schools have a better “feeling,” although an argument can be made for Dartmouth if there is a love of snow and nature. Weather-wise Berkeley wins hands down though, which might be its only compelling case here. Good luck!