Some scientists say that manmade global warming is melting polar glaciers and causing sea levels to rise. But could much of the recent rise be a result of volcanic activity instead? Well as noted in Science News, this theory is now being investigated by oceanographers at the Commonwealth Scientific and Industrial Research Center in Tasmania. According to the story, after each of the 20th Century’s major eruptions, sea levels fell sharply worldwide – such as with Mt. Pinatubo in 1993, where it dropped by five millimeters quickly and recovered at only about a half a millimeter per year. Since sea levels still have not fully risen from then, it is possible that fears about rapidly rising sea levels and global warming may be mostly all wet!