Cooper and Ethan Waisberg love tennis and were brought up to abhor waste. So they developed Balls 4 Eyeballs, a charity that collects and resells tennis balls to raise money for eye health.
Being surrounded by trees makes us feel good. Erin Moir is training to be a certified forestry therapy guide to help others find peace among the trees.
Marine biologist Christine Stortini explains how overfishing throws ocean ecosystems out of whack and makes ocean life more susceptible to the ill effects of climate change.
Aishwarya Puttur is a member of Banking on a Better Future, which raises awareness that customer investments are being used by banks to fund fossil fuel expansion.