Journal – Newcastle-upon-Tyn: THE biggest threat to marine life is not global warming but over- fishing and mankind’s demand for water, scientists from the North will say today. A study drawing on the expertise of more than 100 top aquatic ecologists looked at the world’s water-based ecosystems, including lakes, rivers, tropical waters and Arctic seas. The research, led by Professor Nicholas Polunin of Newcastle University, found man’s serious impact on aquatic life will happen long before climate change …