"The health of life on Earth depends on its oceans. But unless we save our seas from the growing mounds of pop bottles, cigarette butts and plastic trash, soon there won't be much healthy sea left."

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Set the basketball on the kitchen table. Open a cupboard, get out a bottle of sesame seeds, and place a single seed beside the basketball. If you were to reduce the Earth to the size of a basketball, all the fresh surface water on the planet - all those rivers and lakes and ponds and streams - would fit inside that one tiny sesame seed. Add a second sesame seed; now you have all the usable underground water as well. Is fresh water a scarce resource?

— William Ashworth