Excess nutrients from farm fields cause widespread water pollution across the U.S. Bioreactors -- essentially, ditches filled with wood chips -- are emerging as a way to reduce nutrient pollution.
Growing enough food to feed 9 billion people by 2050 will require huge amounts of energy and water. Using nanoparticles to boost plant growth and yield could save resources and reduce water pollution.
A law signed into effect last week seeks to reduce fertilizer runoff that causes toxic algae blooms. But to really address the problem requires taking a hard look at how America farms.