There's not only the carbon dioxyde that counts. If you have ever been around a paper/cardbox factory you know how much it stinks and how heavily they use chemi

There's not only the carbon dioxyde that counts. If you have ever been around a paper/cardbox factory you know how much it stinks and how heavily they use chemicals. I don't have time to read the study but you also have to go beyond first order effects. OK growing the trees might be a carbon sink, but what about the second and plus order: the effect on the soil, heavy use of human machinery, use of pesticide. Just FYI the energy used by laser is extremely low except if you are talking about CO2 laser or something. I would be more concerned about the making of such a laser.