Send In the Clouds?

Pascal Lamy (former director general of the World Trade Organisation) maintains there is an urgent need to agree ways of regulating attempts to geoengineer the climate. He notes that, at present, there is little to stop any government (or individual?) experimenting with geoengineering technologies (https://www.theguardian.com/environment/2022/may/17/climate-geoengineering-must-be-regulated-says-former-wto-head). Geoengineering is a term applied to physical attempts to change the Earth's temperature or climate. Reducing the emissions of 'greenhouse gases', like carbon dioxide, could, in theory, be classed as geoengineering. More obvious examples of 'technofixing' geoengineering include whitening clouds, to reflect more solar radiation back into space. More sunlight could also be redirected from the Earth's surface, by injecting sulfur particles into the atmosphere. A low-tech version, involves painting the roofs of buildings white (we used to have more snow and ice doing the job for us). Some enthusiasts have suggested launching a giant sunshade, to orbit above the Earth. Others, advocate adding iron to our oceans to absorb carbon dioxide. Many of these geoengineering technologies are likely to have detrimental effects on the environment or even the climate in other parts of the globe. Lamy's concern is raised by it now being likely that, the notional limit to global heating of 1.5 degrees Centigrade above pre-industrial levels, will be exceded. He thinks that some countries will be tempted to attempt to 'locally' apply geoengineering technologies without any consultation or agreements.