Funding development and use of so-called mechanical trees designed to clean carbon dioxide from the atmosphere should be funded by tax revenues, says the CEO of an Irish company that produces the structures. The mechanical trees are among technologies developed through research led by Fulton Schools Profess Klaus Lackner, director of the Center for Negative Carbon Emissions at ASU. The trees are among the tools the center has devised for capturing carbon dioxide to reduce the environmental threat posed by greenhouse gases building up in the atmosphere. The work is contributing to the emergence of a carbon disposal industry.