Shifting Climate Zones

Examines how the poleward expansion of the tropics is transforming Australia’s climate, ecosystems and societies, highlighting the urgent need for coordinated adaptation and resilience strategies.

Shifting Climate Zones: The Good, the Bad and the Ugly for Australia is a scholarly monograph that investigates one of the most consequential yet under-examined dimensions of anthropogenic climate change: the poleward expansion of the Earth’s tropical zone and its profound implications for Australia. Driven largely by the widening of the Hadley circulation under global warming, this process is reshaping atmospheric and oceanic patterns at regional and continental scales. Australia’s unique geographical position makes it especially exposed, with more than half of the continent influenced by the southern arm of the Hadley circulation. As a result, long-established climate zones are shifting, Mediterranean-type climates are contracting southwards, and tropical and subtropical regimes are expanding into new regions, with far-reaching environmental and socio-economic consequences.
Adopting a geographical perspective that foregrounds space, place, scale, environment and interconnection, the book synthesises the latest climate science with applied analysis of observed and projected changes. It situates Australian climate trends within a global context, while examining interactions between anthropogenic warming and dominant modes of natural variability, including the El Niño–Southern Oscillation, the Indian Ocean Dipole and the Southern Annular Mode. The book documents how rising temperatures, altered rainfall regimes, intensified heatwaves, droughts, bushfires, floods and marine heatwaves are already affecting Australia’s terrestrial, coastal and marine systems. Particular attention is given to ecosystems, biodiversity and ecosystem services, as well as the implications for agriculture, forestry, fisheries, energy security and water availability across diverse regions.
Beyond biophysical impacts, the monograph explores how shifting climate zones are transforming human systems. It assesses risks to cities and settlements, many of which are highly urbanised, coastal and ageing, alongside the heightened vulnerabilities of remote, regional and Indigenous communities. The book also examines consequences for human health and well-being, tourism, and culturally and economically significant landscapes, from coral reefs and iconic beaches to alpine regions and the Red Centre. Even under optimistic mitigation scenarios that limit warming to 1.5–2.0°C, the analysis demonstrates that continued climatic shifts are unavoidable. The book concludes by arguing for integrated, forward-looking mitigation and adaptation strategies, emphasising the need for coordinated governance to reduce climate risks and strengthen Australia’s long-term environmental, economic and social resilience.