a negative trendP = 0.003
Over the past 65 years, the B IM also showed a negative trend of −0.14 ± 0.04 GtC yr −1 per decade, statistically significant at the 1% level ( P = 0.003), with a positive B IM in the early part of the record and a negative B IM in the most recent years (Extended Data Fig. 1 ).