Learn how you can help the world around you - just by observing and using your smartphone or computer! Litter Journal - Take meaningful conservation action by tracking and removing plastics and other debris from both land and water. Litter Journal data can be used to identify the most problematic debris in the environment and help develop solutions for reducing litter. Globe Observer - Trees - Healthy forests play a crucial role in Earth’s ecosystems as growing trees take up carbon from the atmosphere. Help NASA scientists collect data to calculate how much carbon is stored in a tree or forest by using your smartphone to measure tree height. Wild Spotter - Use the Wild Spotter app to help identify, map, and protect wild places - our country’s parks, forests, wildlife refuges, recreation areas and public land.