Question

Multiple areas across the world of up to almost 2 billion hectares each were devastated during 2019 /2020 by sometimes months-long what?

Answer 1

Forest or bush fires
The fires burnt for months in some cases. Areas all but destroyed include California, Brazil, Australia, Thailand, the Ukraine, Indonesia. The consequences of the fires range from billions of wildlife lost, millions of people losing their homes and livelihoods, impact on climate, to loss of millions of hectares of often irreplaceable plants.