Large numbers of 'marine 'jelly balls' that have appeared off the east coast of Australia could be part of the planet's mechanism for combating global warming, scientists have said. The jellyfish-like animals are known as salps, and feed on small plants in the water called phytoplankton (marine algae). The plants absorb the greenhouse gas carbon dioxide from the atmosphere through the top level of the ocean... Scientists said their numbers were up to 10 times greater than when first surveyed 70 years ago... Their appearance in Australian waters is seasonal but scientists believe the increased numbers are a result of...