In summary, under a high-emission scenario that increases global temperature 4°C by 2100, climate change could increase the global burned area by 50-70% and the global mean fire frequency by ~30%, with increases on one- to two-thirds and decreases on one-fifth of global land . Lower emissions that would limit the global temperature increase to <2℃ would reduce projected increases of burned area to ~35% and projected increases of fire frequency to ~20% . Increased wildfire, combined with erosion due to deforestation, could degrade water supplies . For ecosystems with an historically low fire frequency, a projected 4ºC rise in global temperature increases risks of fire, contributing to potential tree mortality and conversion of over half the Amazon rainforest to grassland and thawing of the Arctic permafrost that could release 11-200 GtC that could substantially exacerbate climate change .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report