Brian von Herzen's Climate Foundation aims to reforest the oceans with engineered seaweed platforms to solve food scarcity, restore ecosystems, and combat climate change. The project won the $1 million Xprize Milestone award and is now competing for the $100 million grand prize in CO2 extraction. Seaweed production in the Philippines has declined due to rising water temperatures, but von Herzen's project offers a potential solution.