From open archaeological data in York we head over to its trans-Atlantic namesake and the New York City Tree Census. In 1995/2005/2015 citizens of the Big Apple helped record location, species and even trunk circumference for every street tree in the city. In 2015 that amounted to a staggering 684,343 trees from 21 different species. The City of New York estimate that these trees contribute $111 million dollars of value per year through stormwater interception, energy conservation, reductions in air pollution, and carbon dioxide. Developer Jill Hubley has built a fantastic map to help you explore the trees and CartoDB have a map showing the changes in tree populations over 20 years. You can get the 2015 New York City Tree Census data from NYC Open Data.