In News The research , published in the Proceedings of the National Academy of Sciences finds that Earth suffered an intense loss of species diversity that lasted for at least 300,000 years , possibly caused by long-lasting ozone depletion . Hangenberg Crisis : It is an event leading to an intense loss of species caused by long-lasting ozone depletion , which would have allowed much more of the Sun’s ultra violet (UV) radiation to reach and harm life on Earth. Extensive volcanism and global warming can lead to the loss of the ozone layer. Researchers also considered the possibility that one or more supernovae explosions at a distance of 65 light-years away from the Earth may have caused a prolonged loss of ozone leading to the Hangenberg crisis. Examples of Supernova: gamma-ray bursts, solar eruptions and meteorite collisions.