XL Renewables is spearheading some fascinating agriculture applications by farming algae on plastic liners. It’s of particular benefit, the company contends, when located next to animal feeding operations that struggle to manage manure. XL’s Super Trough uses a plastic liner beneath water that carries carbon dioxide gas (CO2) and nutrients required by algae to achieve significant yields. Algae can help create something of a wastewater treatment plant for manure.