Billions of human-made chemical particles, once used to
power spray cans and still common in air conditioners and
refrigerators, have worked their way into the atmosphere.
And they're destroying the ozone
layer, the natural "sunscreen" that shields us from harmful
sunlight.
This chapter tells you what's happening to the ozone layer—and
why it matters. You'll encounter the varied forms of solar
radiation,
learn how some can harm us, and get tips on being sun-smart.
Here's what awaits you:
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