G lo be ▁Academy ▁of ▁Sciences ▁in ▁Br no ▁( C zech ▁Republic ) ▁and ▁an ▁international ▁consult ant ▁to ▁the ▁Sloven ian ▁Forest ry ▁Institute ▁( L jub lj ana , ▁Sloven ia ). ▁ ▁Iss ues ▁of ▁Study ▁ ▁His ▁research ▁focused ▁primarily ▁on ▁ec oph ys i ological ▁responses ▁of ▁trees ▁to ▁increasing ▁CO 2 ▁concentr ations ▁as ▁well ▁as ▁on ▁the ▁use ▁of ▁pop lar ▁and ▁will ow ▁plant ations ▁for ▁bio energy , ▁which ▁increased ▁the ▁understanding ▁of ▁the ▁importance ▁of ▁natural ▁e cos ystem s ▁in ▁man aging ▁the ▁global ▁environmental ▁cr ises . ▁ ▁Ren ew able ▁( bio -) energy ▁production ▁from ▁pop lar ▁ ▁Based ▁on ▁the ▁improved ▁knowledge ▁of ▁the ▁bi ological ▁aspects ▁of ▁product ivity ▁in ▁pop lar , ▁he ▁expanded ▁his ▁research ▁after ▁ 1 9 9 0 ▁toward ▁the ▁production ▁of ▁bio energy ▁from ▁pop lar . ▁He ▁investig ated ▁the ▁entire ▁production ▁chain , ▁from ▁the ▁establishment ▁of ▁the ▁bi om ass ▁plant ation ▁to ▁the ▁final ▁production ▁of ▁renew able ▁energy . ▁The ▁focus ▁was ▁on ▁the ▁cultiv ation ▁of ▁pop lar ▁in ▁intens ively ▁managed , ▁high - dens ity ▁short ▁rotation ▁co pp ice ▁( S RC ). ▁He ▁brought ▁the ▁concept ▁of ▁producing ▁bio energy ▁from ▁S RC ▁with ▁fast - g row ing ▁pop lar ▁trees ▁to ▁f ru ition ▁and ▁identified ▁the ▁principal ▁yield ▁determin ants ▁of ▁pop lar ▁for ▁bio energy ... ▁ ▁In ▁ 2 0 0 9 , ▁Ce ule