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What Is the Biosphere? 8
Why Do Uncontrolled Population
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acid acres activities agricultural American amount animals areas atmosphere become biological birth building called carbon cause changes chemical cities conservation consumers contain continue cost countries crops cultural designed diversity earth economic ecosystem effects efforts electricity energy environment environmental example factors federal fertility FIGURE fish forests fuel groups growing growth habitat hazardous heat human important increase individuals industrial known lakes land less levels limited living maintain major materials ment million minerals natural nuclear occur ocean organisms Park percent planning plants pollution population preserve prevent problems production programs protect rain recycling reduce region remain require result rivers Service soil sources species streams substances succession supply tion toxic trees United waste whales wilderness women