Why small technology is the future of environmental stewardship -- The power of small, nimble innovations -- Making environmentalism pay (for you and the planet) -- Aggregating knowledge for the environment -- How diversity removes thousands of cars from the road -- How transparency and blockchain make fish and chocolate better (but not together) -- What the Flint Water Crisis and Thomas Edison have in common -- Enhancing our connection to nature -- What's the downside? -- Solving the biggest problems in the world -- Democratizing environmentalism.