Why is it challenging to test geoengineering approaches in a traditional laboratory setting, as discussed in "Geoengineering at Collective Experimentation"? Geoengineering approaches are not feasible to be tested in a laboratory. Geoengineering approaches are too expensive to be tested in a laboratory. Geoengineering approaches are too dangerous to be tested in a laboratory. Geoengineering approaches require real-world testing to assess their effectiveness