Final answer:
Australia has forest scarcity due to factors like fire occurrence, exclusion of eucalypt forests from rainforest definition, human activities, and climate change.
Explanation:
Forests scarcity in Australia can be attributed to various factors such as Tertiary aridification, increased occurrence of landscape fire, and the exclusion of eucalypt forests from the definition of rainforest due to their regeneration requirements post-fire. Additionally, human activities like extensive logging, slash-and-burn agriculture, mining operations, and climate change contribute to the decline of forests in Australia and worldwide.
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