4.1 Real world trials in SRM
Actually, we are already substantially engineering our climate.
Humans have been manipulating the environment for hundreds, if not thousands, of years: constructing and painting buildings with white materials to keep them cooler (Figure 7), planting trees to increase shade and moisture and reduce wind, and so on. These methods act to manipulate local climate and reduce the severity of, for example, the impacts of extreme heat.
Local SRM-type geoengineering continues with modern methods such as very reflective new roofing materials (Figure 8), or the use of paler road surfacing materials in Sydney, Australia (Sharples, 2014).