With renewable energy advancements we shouldn't have problems with powering city-wide air-conditioning systems.
Architectural engineering would be one of the booming domains, I imagine (re-engineering shorelines, artificial islands - similar to what UAE is doing, or how Miami beach was engineered)
What else? Countries that can afford it - i imagine it's the perfect time to invest in/strengthen military and, most importantly, border security.
Indoor farming with irrigation complimented by a condescension from cooling systems?