High-resolution carbon footprint tracing within and between China<sup>'</sup>s two provincial capitals.

2 , total carbon emissions from both cities show an increasing trend from 2000 to 2020 and passed the significance test at P < 0.01; it was more significant for Nanjing, with a correlation coefficient of R = 0.98 for Nanjing and 0.87 for Changsha.

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Nanjing is higher for the total carbon amount, with the lowest value appearing in 2000 (492.76 × 10 4 t) and the highest in 2018 (2648.09 × 10 4 t); a decreasing trend emerged after 2018.

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