How have greenhouse gas levels changed in recent history?

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Greenhouse Gas Concentrations Have Reached Unprecedented Levels

Greenhouse gas concentrations in the atmosphere have been on a steady upward trajectory, with carbon dioxide and methane levels increasing significantly. These gases are now more prevalent than at any point since comprehensive modern records began. This trend is underscored by the fact that eight of the warmest years on record have occurred within the last decade, indicating a clear warming of the planet by most measurable standards.

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How have greenhouse gas levels changed in recent history?

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