LA using ‘shade balls’ to prevent evaporation from water reservoir
A simple solution is helping to preserve around 300 million gallons of drinking water in LA. Officials on Wednesday helped toss the last of the 96 million so-called “shade balls” into the Los Angeles reservoir. The black, plastic, four-inch balls are weighed down by water and help block sunlight to prevent algae growth and evaporation. The solution is expected to save about $250 million dollars. John Blackstone reports.