Richard Du Toit / Mine dump showing ponds, Johannesburg, South Africa

Richard Du Toit / Sediment filled water in gold mine, Johannesburg, South Africa

Richard Du Toit / Aerial view of cooling towers at Kelvin Power Station, Johannesburg, South Africa

Richard Du Toit / Aerial view of cooling towers at Kelvin Power Station, Johannesburg, South Africa

Richard Du Toit / Red knobbed coot {Fulica cristata} feeding chicks, Johannesburg, South Africa

Pat De La Harpe / Xhosa Initiate, Lesedi Culture Village, Johannesburg, South Africa

Richard Du Toit / Johannesburg skyline at sunset. South Africa

Richard Du Toit / Mine dump showing erosion, Johannesburg, Gauteng, South Africa