New virus variants threaten a summer Covid-19 wave, but experts say the risk remains uncertain | CNN Covid-19 levels are about the lowest they’ve ever been in the United States, but another new crop of virus variants once again threatens to disrupt the downward trend as the country heads into summer. Deidre McPhillips CNN

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The mutations of the FLiRT variants make increased transmissibility — and a possible summer wave — a real threat. Covid-19 is settling into some seasonal patterns, which have included a summer bump in years past, but the exact level of risk for this year is unclear.

Extreme heat will put millions more older adults at risk in the future By 2050, as many as an additional 246 million adults 69 and older could experience temperature extremes that exceed 37.5° Celsius. Aimee Cunningham Science News

The new projection suggests that more than 23 percent of the global population of these older adults — largely concentrated in Africa and Asia — will encounter this intense heat, compared with 14 percent today.

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New study calculates climate change's economic bite will hit about $38 trillion a year by 2049 A new study says climate change will reduce future global income by about 19% in the next 25 years compared to a fictional world that’s not warming, with the poorest areas and those least responsible for heat-trapping gases taking the biggest monetary hit. AP News

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