Former federal climate experts warn that atmospheric carbon dioxide concentrations hit a record high in May and that the monthly average global temperature this summer could rise as much as 3. 5 degrees Fahrenheit (1. 9 degrees Celsius) above the pre-industrial benchmark used to measure the heati...

Source: [Inside Climate News](https://insideclimatenews.org/news/17062026/summer-heat-spike-as-global-warming-surges/)

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