Citizen scientists' record warming data , USA TODAY Project BudBurst, a national field campaign for "citizen scientists," is designed to help record how the planet is warming by tracking the dates that 60 plant species leaf and flower this spring and summer. Climate change is about more than endangered polar bears in the Arctic or melting ice sheets in the Antarctic. The flowers and plants in your own backyard or neighborhood park also may have a role in this global drama. Students, gardeners and interested residents of the 50 states enter their observations into an online database. After a trial run in 2007 that included reports from 26 states, the project is in full swing this year with thousands of people signed up. "You read about climate change all the time, but this project gives people the opportunity to actually participate in climate-change studies," says Sandra Henderson, coordinator of the project, which is operated by the University Corporation for Atmospheric Research in Boulder, Colo. "There aren't enough scientists around. In this project, citizens can be the sentinel eyes on the landscape." The science involved is known as phenology, an ancient study that measures the timing of life-cycle events of all animals and plants. Phenologists observe the environment to figure out what "calendar" or "clock" plants use to begin to flower, to leaf and to reproduce. "This is simple observational science," Henderson says. "The project is designed to help both adults and children understand the changing relationship among climate, seasons and plants while giving the participants the tools to communicate their observations to others." Why now? Scientists report climate change is affecting plant and animal species throughout the world. SURVEY: Complex attitudes rain on climate change "There's been a dramatic warming in the USA and Europe over the past 30 years," says Paul Alaback, a professor of forest ecology at the University of Montana and a science adviser for Project BudBurst. "All over the country, people are noticing that they can grow more southerly plants farther north. There's also been a lot of data that shows that plants are flowering earlier in the spring