Determinizing the contributions of human activities and climate change on greening in the Beijing-Tianjin-Hebei Region, China.

The trends were further categorised into the following categories: insignificant increase ( β ≥ 0, P > 0.05); significant increase ( β ≥ 0, 0.01 < P ≤ 0.05); extremely significant increase ( β ≥ 0, P ≤ 0.01); insignificant decrease ( β < 0, P > 0.05); significant decrease ( β < 0, 0.01 < P ≤ 0.05); and extremely significant decrease ( β < 0, P ≤ 0.01).

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