climate change may exceed it within a few decades

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kazuhiko fudaba

Senior Member
In the article of the Washington Post : Amazon fires could accelerate global warming and cause lasting harm to a cradle of biodiversity,
there is a sentence as follows.

A study Gomes co-authored this year found that while deforestation is the main threat to Amazonian tree species,
climate change may exceed it within a few decades. The research found that a combination of climate change-related impacts,
such as increased dryness, along with deforestation to make way for agriculture, could cause a decline in Amazon tree species richness of nearly 60 percent.

Question) What does the pronoun "it" in this sentence refer to?

Thank you in advance.
Kazu Fudaba
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