<p>While a jittery Mexico recuperates from a series of earthquakes, a steady stream of smoke emerging from the Popocatepetl volcano has
been yet another reminder of the nation's geological vulnerability.</p>| <p>While a jittery Mexico recuperates from a series of earthquakes, a steady stream of smoke emerging from the Popocatepetl volcano has
been yet another reminder of the nation's geological vulnerability.</p> |