Start learning about environmental science by becoming an observer of weather and seasons in your own neighborhood. Each day, look outside and notice what the sky looks like, how the temperature feels, and whether plants and animals are doing anything different than yesterday. Ask questions like "Why are there more bugs on warm days?" or "Where do puddles go when they disappear?" and talk with family members, teachers, or librarians to find answers that help you understand how nature works.
 

Start a nature journal where you observe and record one small part of your yard or a nearby park every week for a month. Each time, draw or photograph what you see, write down the weather and temperature, and note any changes in plants, animals, or the environment. At the end of the month, look back through your journal to spot patterns—maybe certain insects only appear on warm days, or a particular plant grows taller each week—and write down what you think those patterns might mean.

Visit a local nature center for one of their guided nature walks led by naturalists who teach you how to identify plants, animals, and signs of wildlife in your area. During the walk, ask questions about what you see, listen to stories about how the ecosystem works, and practice observing nature the way environmental scientists do. Many nature centers offer these walks for free or low cost and welcome families with children who want to learn more about the environment.