Taiwan issues warnings as Typhoon Champi nears

A powerful typhoon headed toward Taiwan on Thursday, triggering the cancellation of dozens of flights and prompting warnings for locals to prepare for heavy rain, strong winds and giant waves.

Methane emissions in Baltimore show seasonal, daily trends

Natural gas leaks are a significant source of methane emissions in cities, but it can be hard to pinpoint exactly where and why they happen. And methane, a potent greenhouse gas that is the main chemical component of natural ...

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