No simple, low-cost way to monitor the earth/ecosystems and get real time data.
A fixed wing autonomous aircraft that monitors natural features; the health of a rainforest, Poaching detection, Animal specie number and health. Humans are brought into the loop only when something goes wrong (Completely autonomous anomaly detection). A variety of payloads can be fixed onto a high endurance, low speed, very quiet drone. We imagine a fully autonomous sensor network for the planet in 20 years (made up of these drones), with real time data available to anyone around the world.