This NASA map shows the size of aerosol particles in the atmosphere. Green areas indicate larger, more naturally occurring particles like dust. Red areas indicate smaller aerosol particles, which can come from fossil fuels and fires. Yellow areas indicate a mix of large and small particles.
NASA Earth Observations
Members of the Italian metalworkers trade union Fiom-CGIL march during a protest in Rome on March 9. Thousands of trade unionists protested on a day of strikes against auto giant Fiat and the government's plans to overhaul labor laws to make it easier to fire workers.
Filippo Monteforte/AFP/Getty Images
Afghan miners in a makeshift emerald mine in the Panjshir Valley in 2010. Reports suggest that Afghanistan is sitting on significant deposits of oil, gas, copper, iron, gold and coal, as well as a range of precious gems like emeralds and rubies. Currently these minerals are largely untapped and are still being mapped.
Majid Saeedi/Getty Images