In a remote South African village, Paulina Mhlongo sits in the yard as health workers in green protective gear move briskly through her home, soaking the walls with anti-mosquito insecticide.
Experts say climate change is a key element in the spread of a tropical species that thrives in warm weather and disappeared after cold snaps in the U.S.
Most of the stadiums for this year's FIFA World Cup are now considered green buildings and the majority earned their certification in the run-up to the tournament.
