Environment: Pardon El Chichon's Dust

A vast volcanic cloud from Mexico may bring a cooler summer

When Mexico's El Chichón volcano came abruptly to life in late March and early April after more than a century, it killed 187 people, forced thousands from their homes and created havoc over a wide area of Mexico. Since then, 3,721-ft. El Chichón (The Lump) has simmered down, giving off only occasional blasts of steamy vapor. But the mountain continues to be an object of intense scientific concern. Though the initial blowup was relatively small. El Chichón pumped so much dust and debris...

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