Macro Oceans turns seaweed into a replacement for petrochemicals used in everything from cosmetics to packaging. In an underwater farm off the coast of Alaska, seaweed is quickly growing as it dangles from long floating lines. Within weeks, the kelp—which was planted last fall—will be harvested. Then it will be sold to Macro Oceans, a startup that will convert it into the building blocks for products like biodegradable packaging.Read Full Story