Because society has become addicted to technological consumption and the belief that more = better.
Saving the environment has become more about gizmo-green (LEED! Windmills! Trees. On. Roofs!) than actual passive-green. The existing economic order is happy to accommodate the former, largely because it's progressive-looking, flashy, and results in more consumption while the underlying systems are unchanged.
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And of course, when things go wrong, these machines prove to be incredibly delicate and in many cases, unrepairable. And another side effect are the increasing numbers of unexpected second and third-level effects that are the result of making things so complex (i.e. unrecyclability of the tech, destructive off-shored extraction for manufacturing, huge global supply chains, toxins in manufactured materials).