A new international study shows trees in the Amazon rainforest have grown larger over the past 30 years. Rising CO2 levels and better resource availability are driving this growth, but researchers warn extreme climate impacts could offset the gains.

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• Amazon trees grew 3.2% per decade, linked to CO2 rise

• Growth noted across canopy and non-canopy trees

• Larger trees up 6.6% per decade

• Small stem trees declined 1.2% per decade

• Understorey trees fell 3.6% per decade

• Study covered 188 plots, 100+ researchers, 60+ universities

• Published in Nature Plants journal this week

• Amazon remains key global carbon sink

• Growth may boost carbon balance, but climate risks remain

• Droughts, storms, heatwaves could soon reverse benefits