Testament, the Bay Area thrash metal band, released their third album Practice What You Preach in 1989 on Atlantic Records and Megaforce Records. The band had several successful singles from the record, including the title track and the song "Greenhouse Effect," an early warning about climate change. The album was a hit, supported by music videos on MTV and songs on the radio. But despite the track's popularity, the song hasn't been performed in concert since the 90s. So if you're a fan and want to show off your favorite song, this is the shirt for you. This vintage Testament shirt, in excellent condition, is from the band's Greenhouse Effect tour in support of Practice What You Preach.