Monitor air pollution levels and map air pollution around the US

To promote nature exploration and discovery

To learn how climate & urbanization affect tree growth & health

Help scientists by observing seasonal changes in plants.

Help produce predictions of Earth’s climate.

To capture our changing coastlines

Understand environmental indicators of climate change.

Monitor drying and flowing streams and rivers

Help monitor butterfly populations worldwide using checklist surveys

Study biodiversity and phenology in response to climate change.