If navigating the growing market for sustainable products seems sometimes daunting, then the massive sunscreen market can feel like a confusing minefield peppered with glossy marketing and greenwashing. Let me just get this out there: every year, 14,000 tons of sunscreen ends up in the world’s oceans. You rub it on to protect your skin and then you take a swim — or have a shower later — and wash it all off. Far too many sunscreens contain…