▁o vens . ▁When ▁the ▁char co al ▁is ▁ready ▁it ▁is ▁transport ed ▁by ▁tr uck ▁to ▁the ▁industrial ▁area ▁of ▁greater ▁Bel o ▁Hor iz onte . ▁ ▁In ▁addition ▁to ▁the ▁e colog ical ▁damage ▁of ▁destroy ing ▁the ▁land ▁to ▁plant ▁trees ▁of ▁only ▁one ▁species , ▁the ▁physical ▁ris ks ▁for ▁the ▁char co al ▁workers ▁are : ▁excess ive ▁fat igue ▁due ▁to ▁lif ting ▁and ▁transport ing ▁heavy ▁materials , ▁which ▁can ▁bring ▁on ▁physical ▁stress ▁and ▁cause ▁damage ▁to ▁various ▁mus cles ▁and ▁ske let al ▁structures ▁( one ▁study ▁showed ▁that ▁a ▁typical ▁char co al ▁worker ▁will ▁carry ▁ 7 , 0 0 0 ▁kil os ▁of ▁Eu cal y pt us ▁wood ▁to ▁fill ▁a ▁ 5 ▁cub ic ▁met re ▁o ven ▁in ▁one ▁hour ! ); ▁long ▁hours ▁of ▁work , ▁including ▁sh ifts ▁during ▁night s ▁and ▁the ▁week ends , ▁which ▁brings ▁about ▁alter ations ▁in ▁bi ological ▁rh yth ms , ▁increasing ▁the ▁risk ▁of ▁acc idents ▁on ▁the ▁job , ▁difficulty ▁in ▁sleep ing , ▁chron ic ▁fat igue ▁and ▁loss ▁of ▁emot ional ▁control ; ▁and ▁dust ▁and ▁smoke ▁in hal ation , ▁causing ▁skin ▁ir rit ations , ▁conj unct iv itis , ▁and ▁resp ir atory ▁problems . ▁ ▁Brazil ▁is ▁the ▁largest ▁world ▁producer ▁of ▁" fer ro - g usa " ▁or ▁p ig ▁iron ▁( used ▁in ▁the ▁production ▁of ▁steel ), ▁which ▁has ▁as ▁its ▁base ▁this ▁char co