A bit of encouragement to show how effective mass habit-changes can be.
"digital photography has helped reduce silver pollution in the water of Sweden's capital. 'Tests have shown that silver levels have dropped by more than half in five years in the waters of the Stockholm archipelago.' More digital photography means that there is less developing of conventional silver-halide film, and nowadays at least 90% of all cameras sold in Sweden are digital."
Treehugger: Less Silver Pollution Thanks to Digital Photography:
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