🌭 Top 10 best fair foods 🐧 Bye-bye, emperor penguins 🏢 S.D.’s best architecture 🚆 Amtrak’s new round-trip to L.A. San Diegans marched and chanted and hoisted signs deriding ...

For the first time on record, monthly average CO2 levels exceeded 430 parts per million (ppm), according to experts at Scripps Institution of Oceanography, San Diego.