Volcanoes: Scientists warn that world must begin preparing for explosive global catastrophe
'An explosive eruption large enough to cause huge numbers of deaths, alter the climate and poison the atmosphere occurring by the end of the century...The ash cloud thrown out from this eruption reached more than 26 miles (43km) into the atmosphere and triggered temperature changes that led to widespread famine and epidemics. The summer following the Tambora eruption is known as 'the year without summer'.
