`` Synthetic tree '' would capture carbon dioxide in the air to reduce emissions . Comment: `` I argued back then and I still argue that the reason this can be done , from a theoretical point of view , is that the CO2 in the air is actually surprisingly concentrated , therefore the device you need to collect CO2 is quite small . '' Technology is being developed by scientists at Columbia University in the U.S. Broecker : `` I think this is something that the world 's going to have to have ''
`` Synthetic tree '' would capture carbon dioxide in the air to reduce emissions . Comment: Technology is being developed by scientists at Columbia University in the U.S. Broecker : `` I think this is something that the world 's going to have to have ''