Buildings account for 31 p.c of carbon dioxide emissions globally, so there is a big opportunity for the true estate trade to assist. A lot can be carried out with out including important prices to development, argues Jesse Keenan, an editor of the U.N. Report and real estate professor at Tulane University in New Orleans. Over the course of the pandemic, properties have been promoting quickly — in reality, some even inside a matter of hours after itemizing. Emma Stone bought a 5,000-square-foot mansion in Austin from a high-profile commercial real estate mogul. The two most expensive houses to go…