Oceans could be restored to their former glory within the next 30 years, according to researchers from the King Abdullah University of Science and Technology in Saudi Arabia. A new scientific review, published in the journal Nature, points to the remarkable resilience of the ocean. For instance, Humpback whale numbers have rebounded since the commercial whaling ban and elephant seals have returned in the US. The report, however, highlights that conservation efforts have to doubled up and that climate change remains a big challenge. But, we have the skill and expertise to bring these marine habitats back to life, said experts.