Kayayyaki
- Karfe Warwatsesun hada da gallium (Ga), indium (In), titanium (Ti), germanium (Ge), selenium (Se), tellurium (Te), da rhenium (Re).Wannan rukunin karafa ba su da ƙarancin yawa a cikin ɓawon burodin ƙasa amma suna taka muhimmiyar rawa a cikin nau'ikan masana'antu.Misali, karafa da aka warwatse ana gane su azaman kayan tallafi don sadarwar kwamfuta ta lantarki, sararin samaniya, makamashi, da magunguna & sassan kiwon lafiya.Karfe da aka warwatse suna taka rawar da ba za a iya maye gurbinsu ba a cikin wasu fasahohin makamashi mai tsafta da kayan ci gaba, kuma za su zama mafi mahimmanci a nan gaba.
- Yin amfani da ragi don ƙididdige albarkatu, da yin amfani da rarraba don ƙididdige yawan amfani.Amfani da karafa da aka warwatse a duniya ya karu sosai a cikin 'yan shekarun nan.Koyaya, a halin yanzu, rashin daidaituwa na amfani, masana'anta da sake yin amfani da karafa da aka tarwatsa suna da matuƙar wahala wanda ke haifar da ƙarancin wadatar wadatar kayayyaki.Don haka, tabbatar da abin dogaro, oda da samun dorewa zuwa waɗannan tarwatsa karafa daga ma'adanai, samfuran aiki zuwa sharar gida ya zama dole.
- Gudanar da sake amfani da UrbanMines na Karfe Watsewa yana ba da mafita mai dorewa ga duniya da aka raba gari.