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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白宮發言人戴維斯·英格爾（Davis Ingle）回覆關於「2025計劃」的提問時說：「僅僅一年時間，特朗普總統便讓美國成為世界上最火熱的國家——包括鞏固邊境、簽署歷來最大幅度的中產階級減稅方案，以及引進萬億元規模的投資。」
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