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The COP27 climate negotiations in Egypt put a spotlight on the problem of methane emissions, which are responsible for more than a quarter of the warming on the planet today. More countries are pledging to reduce those emissions, but methane leaks remain a serious problem. Science correspondent Miles O'Brien reports.
Dusty wells. Streams ebbing away. Pristine reserves aflame. Some scientists think the tipping point is already here.
The world’s biggest single-building pig farm has opened in Hubei province, but critics say it will increase the risk of larger animal disease outbreaks