In this episode, citizen scientists are using a wide array of technology applications to collect data on environmental concerns. A group of individuals are using an app to count birds, which generates data on a changing climate. Surfers, using smart tech, track ocean acidification and coastal temperatures. Other projects include collecting data on the migration of monarch butterflies and surveying horseshoe crab populations. In Uganda, World Bank economists and local partners generate data for sustainable development. Part of "The Crowd and the Cloud" series.