A Queensland ecologist who suggested 4WDs should be partially banned on the beach to protect wildlife is refusing to back down after being flooded with death threats.

University of the Sunshine Coast Professor Thomas Schlacher called on the government to consider outlawing all-terrain vehicles on parts of the sand due to the irreversible damage it causes to marine creatures.

He took his family to the United States for a period earlier this year when vitriol from some 4WD drivers became so inflamed that he was even sent a letter that read "we know where you live".

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Schlacher has since resumed his vocal opposition of 4WD beach tourism – and told nine.com.au he won't stop advocating for A

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