Happy Earth Day!

Happy Earth Day! The purpose of the day is to inspire appreciation for the earth's environment and awareness of issues that threaten it. With that in mind, here's a look at some environment-related chemistry. I selected features that focus on cool features of the environment, like snowflakes and changing leaves, as well as issues, such as the greenhouse effect and fluoridation of drinking water.

Photo: NASA image, featured on the unofficial Earth Day flag.

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