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… Summary Sources of anthropogenic (human-caused) underwater noise have increased significantly over the past fifty years, … shipping is one of the main contributors to anthropogenic noise and is mainly generated by propeller cavitation and … Ocean, acoustic tracking indicates that low frequency noise, < 80 hertz (Hz), has increased by 10 to 12 decibels …
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… and Public Awareness $106.4 million $22,503,039 Total, all pillars $1.7343 billion $374,240,131 … Horizontal Initiative …
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