What if entrepreneurs could harness the power of business to actually make it profitable to quickly rebuild coral reefs? That’s the bet Coral Vita is making. The Bahamas-based start-up is pioneering on-land coral farming techniques that rapidly grow corals at 50 times the pace they’d normally grow, then transplanting them onto imperiled reefs.

Human rights and environmental advocates have tried to reform the diamond mining industry, but what if the answer was as simple as just growing diamonds in a lab? That’s what start-ups like Ada Diamonds are betting on. They sell lab-grown diamond jewelry that’s molecularly identical to naturally-formed diamonds, but for only two-thirds the price. In fact, the FTC just changed its definition of “diamond” to make it clear that lab-grown diamonds are indeed real diamonds, and that companies like Ada can market them as “cultured diamonds.”

Hear from Joe in this new interview about his journey from working at Ferari to founding a guitar company to now founding and running a company whose goal is, just like Dr. Seuss’s Lorax, nothing short of saving the trees.

Black pollution is the new green in India, as Bharti Singhla points out in this episode. A chemical engineer, Bharti’s the executive vice president of strategy for Chakr.in–a start-up founded in 2015 that’s innovating a way to clear the air in a nation that according to the WHO has 14 of the 15 most polluted cities on the planet.