Jennifer Fitchett, University of the Witwatersrand Each year around mid-summer, somewhere between December and mid-January, the skies of South Africa’s Gauteng province, including the city of Johannesburg, fill with small white butterflies. Some land in people’s gardens, allowing a closer look at the thin brown markings on their wings. Those markings give the butterflies their … Continue reading White butterflies are filling Johannesburg’s skies earlier than usual. Climate change is to blame