Daniel Harrison thinks he has an answer to saving Australia's Great Barrier Reef from rising ocean temperatures: a high-powered water cannon.
Harrison, a research fellow at the Sydney Institute of Marine Science, wants to shoot salt particles into the sky above the reef. To do that, a US team he collaborates with has created a nozzle that can shoot a spray comprising incredibly small droplets.
Now they need a cannon that can use these nozzles to shoot water carrying nano-sized salt particles into the air. About 5 percent of the salt, if all goes to plan, will float up into the sky. As it floats, Harrison hopes, the salt will be absorbed by the clouds above.