Update: Nature's Notebook

Nature's Notebook is a national plant and animal phenology observation project that lets citizen scientists record observations that scientists, educators, policy makers and resource managers can use to understand how plants and animals are responding to climate change and other environmental changes. The project has more than 900,000 entries covering 16,000 individual plants and animals at 5,000 sites.

Scientific American added Nature's Notebook to its Citizen Science listings a year ago, and researchers at the USA-National Phenology Network, which manages the project, want the data to keep on coming, particularly as they study the weak winter of 2012.

See more projects in Free,  Observation,  All Ages.