Author Archive | Luke Walker

Looking for AGW in a Sea of Natural Variability: Declining Rainfall in SW Western Australia (Part 2) – A Note from Luke Walker

Finding anthropogenic global warming (AGW) shapes in the fog of variability is a major challenge, simply because natural climate variability is large.  And then the problem becomes attributing those changes to a climate mechanism in an interlinked dynamic climate system. One of those climate detective stories taking some intriguing twists and turns is the rainfall […]

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Looking for AGW in a Sea of Natural Variability: Drought to Flood (Part 1): A Note from Luke Walker

After the Queensland floods, Stewart Franks’ research on the interaction of El Nino-Southern Oscillation (ENSO) and the Interdecadal Pacific Oscillation (IPO) driving cycles of drought and flood in Australia has been advanced as the rebuttal to the proposition by some politicians and scientists that anthropogenic climate change has had a role in recent events. And […]

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Flood Crisis Consistent with Accentuated Hydrological Cycle: A Note from Luke Walker

Yesterday David Karoly from Melbourne University’s school of earth sciences told the Sydney Morning Herald that while individual events could not be attributed to climate change, the wild extremes being experienced on the continent were in keeping with scientists’ forecasts of more flooding associated with increased heavy rain events and more droughts as a result […]

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Old Growth Forest as Official Carbon Sink: A Note from Luke Walker

At the United Nations climate conference in Bali last year delegates agreed to include forest conservation in future discussions on a new global warming treaty.  If adopted, REDD (Reducing Emissions From Deforestation and Degradation) means that the value of carbon in intact forests can be realized in carbon accounting.   Environmentalists see REDD as a […]

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Ferals go Crazy on Australian Sub-Antarctic Island: Who Cares? A Note from Luke Walker

Rabbits and rats are posing a severe threat to World Heritage values on Macquarie Island, as research reveals widespread damage to terrestrial ecosystems. This includes destruction of vegetation (habitat for threatened albatross species and other seabirds), and catastrophic erosion. Macquarie Island Under Threat Erosion and heavy spring rains have caused a large landslip on Macquarie […]

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New Future for the Last Great Savanna: A Note from Luke Walker

A new report The Nature of Northern Australia** advocates responsible conservation and development of one of the world’s great ecological treasures – the northern Australian tropical savanna. This vast area represents some 25% of the world’s remaining tropical savanna woodlands and is still in good ecological condition, some 1.5 million km2 extending from Cairns and […]

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The Language of Climate Change: A Note from Luke Walker

Last night Australia’s “premier television current affairs program” Four Corners showed a documentary purportedly about the “campaign to deny the science of global warming”. A regular reader and commentator at this blog, Luke Walker, emailed me the following comment on the program: Hi Jennifer, ABC Four Corners last night aired CBC’s news magazine show The […]

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Killer Greenhouse Effect (or Pardon my Anoxia): A Note from Luke

Luke Walker reminds us that geological history includes evidence of mass extinctions from “killer greenhouse conditions”: “Readers of this blog are often witness to accusations of alarmism by those opposed to scenario projections using contemporary anthropogenic global warming theory. Comfort is often taken in the world having survived substantial climate swings in geological time and […]

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