One area of data sources would be nature itself - plants, insect, birds, mammals - all of those can act as sensors, the ability to measure those more accurately would be more useful IMHO. Though even when the signs are clear with all those natural sensors - people still demand more data. It's as if we live in a World that won't accept the warning sign, unless it is an approved font,colour,size and been approved by a committee that expands at a rate faster than it can vote.
