Harmful algal blooms are taking over as the world warms and grows richer in carbon dioxide—and there’s no easy fix. An algal bloom clogging a waterway near Lough Neagh in Northern IrelandChris Baraniuk Standing on the marina, Rob Skelly peers into the darkness of the river where bright speckles of algae drift in the water. A neon green invader. “It’s starting to build,” he says. “Tomorrow, you’ll
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