Tony Heald / Women and children picking through rubbish on landfill site, residents of the site. Guwahati, Assam, India. 2009.

Tony Heald / People picking through rubbish on landfill site, residents of the site. Guwahati, Assam, India. 2009.

Nigel Cattlin / Barren brome (Bromus sterilis) panicle.

Nigel Cattlin / Barren brome (Bromus sterilis) unripe nodding panicle.

Ashley Cooper / People displaced by flooding carrying food aid, Chiteskesa refugee camp, near Mulanje, Malawi, March 2015.

Ashley Cooper / Boat ferrying food supplies across flooded farmland near Mulanje, with maize crops destroyed by the floods in the foreground. Malawi, March 2015.

Ashley Cooper / Boat ferrying food supplies across flooded farmland near Mulanje, with maize crops destroyed by the floods in the foreground. Malawi, March 2015.

Ashley Cooper / Houses damaged by the floods in Makhanga. Malawi, March 2015.

Ashley Cooper / Medecins sans Frontieres volunteer, Makhanga pumping out a ground water drinking well that has been contaminated by polluted flood water after the January 2015 floods. Malawi, March 2015.

Ashley Cooper / Medecins sans Frontieres clinic in Makhanga testing local people, many of whom now have malaria. A result of the January 2015 floods, the drying up flood waters provided an ideal breeding grounds for...

Ashley Cooper / Medecins sans Frontieres clinic in Makhanga testing local people, many of whom now have malaria. A result of the January 2015 floods, the drying up flood waters provided an ideal breeding grounds for...

Ashley Cooper / Medecins sans Frontieres clinic in Makhanga, with anti malarial drugs to treat local people, many of whom now have malaria. A result of the January 2015 floods, the drying up flood waters provided a...