Dozens have perished in Brazil's sixth-largest city after a record-breaking deluge.
Snow may have fallen at the lowest elevation ever observed in the state.
Climate change will make for more frequent wild swings in California weather, with both more extremely dry and extremely wet years and 'weather whiplash' in between.
The concentration of the heat-trapping gas topped 420 parts per million, while the planet has warmed more than two degrees. This is the highest daily average concentration to be recorded. Data was collected at the Mauna Loa Observatory on the Big Island of Hawaii.
Nearly 80 million people in the United States remained under a heat advisory or warning Tuesday, with scorching temperatures and humidity expected through the Fourth of July.
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