In a series of short and funny videos, Apple celebrated Earth Day.

• Lisa Jackson, Apple’s lead on Environment work, gives a crash course on how our 40-megawatt solar farms in China produce enough electricity for all of Apple’s offices and retail stores in the country—and grass to feed yaks.
• None of Apple’s 14 final assembly facilities in China send any waste to landfills. As in zero. And that all started when John Reynolds in iPhone Product Operations visited a factory in Guanlan, China.
• Apple Park uses outside air to cool the building naturally, reducing the campus’ cooling load by 35 percent a year. Apple’s VP of Real Estate, Dan Whisenhunt, breaks down why this is well…cool.
• Apple’s toxicology experts Rob Guzzo and Art Fong will grossly tell you how we make about 30 gallons worth of sweat every year, and how it keeps you safe.