Nutrient deficiencies, especially of nitrogen, triggered more intense colour in maples as the trees attempted to lessen the effects of sunlight.
ECONOMIST: The science of autumn
The heatwave across Australia in recent weeks has been so intense that the Bureau of Meteorology has had to add a new shade to its colour-coded temperature chart, so the scale now reaches above 50C.
BBC: Sydney bakes on hottest day on record as bushfires rage
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