Carbon trading and COVID-19: a hybrid machine learning approach for international carbon price forecasting.

In contrast, in the sample of between 1700 and 1900 observations (taken in the period between November 2020 and June 2021), we see a clear trend of precipitous falls and sharp rises.

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The GDEA, on the other hand, first demonstrates a decreasing trend followed by an increasing trend during the sample period, reaching its lowest point during 2016.

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