An ice-core record of hydrogen reveals that atmospheric levels vary in response to climate change and have increased drastically owing to human activity since the pre-industrial era. The apparent sensitivity of hydrogen cycling to environmental conditions should be considered when projecting the consequences of rising anthropogenic hydrogen emissions in a warming climate.
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AP writers Melissa Goldin, Tim Reynolds and John Wawrow as well as the Canadian Press contributed.。WPS官方版本下载对此有专业解读
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