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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Trump also said at the time that there would be "no more oil going to Cuba". His administration has blocked shipments from Venezuela and threatened tariffs on other nations delivering oil to the island.