He has advocated prospective use of fast growing trees and grasses as an alternative to corn sources for producing ethanol .
In particular , Podila studied genes that regulate growth in fast growing trees , especially poplar and aspen .
Podila has advocated prospective use of fast growing trees and grasses as an alternative to corn sources for producing ethanol .
In particular , Podila studied genes that regulate growth in fast growing trees , especially poplar and aspen .