tennis ball: Tennis balls may take 400 years to decompose; Environmentalists, game's governing body clueless - The Economic Times

Tennis ball wasteland? Game grapples with a fuzzy yellow recycling problem

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Green Tennis – Save our environment one ball at a time

TENNIS BALL AFTERLIFE – Defender

UAH Global Temperature Update for March, 2017: +0.19 deg. C - Roy Spencer, PhD.

RecycleBalls: Giving tennis balls a second life through recycling

Don't let Tennis Balls be another landfill waste

Ecological impact of tennis balls is out of bounds, environmentalists say - CBS News

The Ephemeral Tennis Ball: Addressing Sustainability in Sports – State of the Planet

New balls please: How one company is giving discarded tennis balls a new lease of life

New balls please: How one company is giving discarded tennis balls a new lease of life

New balls please: How one company is giving discarded tennis balls a new lease of life

Why Tennis Balls are an Environmental Disaster