The difference between the annual minimum and maximum concentrations of carbon dioxide (the amplitude) is increasing as plant productivity improves, particularly in northern ecosystems.
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The symbiosis by which nodule bacteria make atmospheric nitrogen available for plants has very likely exactly one evolutionary origin, about 100 million years ago
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With many regions of the world becoming more arid as a result of the climate change, the crop yield also decreases. New types of crops should therefore be more resistant to aridity.
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