In 1973, scientists added phosphorus to half of an Ontario lake; within two months, it turned bright green and helped change water pollution rules

By separating Lake 226 with an impermeable curtain, scientists created two distinct environments. One was supplemented with phosphorus, leading to a substantial algal bloom, while the other remained untouched. This experiment underscored the impact of phosphorus, contributing vital evidence for the need for stricter global regulations on phosphorus usage, influencing policies such as the ban on phosphates in household detergents.
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