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In this Review, we aim to reveal an unrecognised source of causality leading to increases in combustibility, intensity, and the extent of California, United States of America wildfires, and the concomitant harm to human and environmental health. We review literature, including scientific and medical, and evidence, including photographic, of near-daily, near-global jet-spraying particulates in the atmosphere as related to wildfires. We review the evidence that atmospheric manipulation utilising aerosolised coal fly ash is a primary factor in the extent and severity of forest fires in California and elsewhere; adverse effects include exacerbation of drought, tree and vegetation die-off and desiccation, and unnaturally heating the atmosphere and surface regions of Earth. Forest combustibility is increased by moisture-absorbing aerosolised particles that damage the waxy coatings of leaves and needles, reducing their tolerance to drought. The aerial climate manipulation using coal fly ash greatly increases the potential for forest fire ignition by lightening. Wildfires dramatically worsen baseline air pollution, emitting harmful gases and volatile organic compounds, and they both concentrate and re-emit toxic elements and radioactive nuclides over a wide area. The type of air pollution created by wildfires is associated with increased all-cause mortality, with the greatest impact on respiratory and cardiovascular disease. Studies have shown that aerosolised coal fly ash is an important risk factor for chronic lung disease, lung cancer and neurodegenerative disease. Failure to recognise multifold adverse consequences of jet-spraying particulates into the atmosphere, we submit, will continue the progression of ever-accelerating ecological disasters.