Ashley Cooper / Rush hour traffic on the M60 motorway near Manchester UK. January 2007

Ashley Cooper / Poor air quality caused by dust from the ongoing drought near Bakersfield, California, USA. October 2014.

Matthew Maran / Hottentot fig (Carpobrotus edulis). This originates in South Africa but is a known invasive having escaped from gardens, and impacts on coastal vegetation and cliffs. Devon, England, UK, November.

Sue Daly / Hottentot fig (Carpobrotus edulis) Alderney, British Channel Islands, May.

Sue Daly / Hottentot fig (Carpobrotus edulis) Alderney, British Channel Islands, May.

Adrian Davies / Hottentot fig (Carpobrotus edulis) in flower, La Gomer, Canary Islands

Cyril Ruoso / Ice Plant (Carpobrotus edulis) an introduced and invasive species, Corse / Corsica, France, May

Cyril Ruoso / Ice Plant (Carpobrotus edulis) an introduced and invasive species, Corsica / Corse, France, May

Mike Read / Hottentot fig (Carpobrotus edulis) Alentejo Region, Portugal, April.

Brent Stephenson / Introduced and invasive Hottentot fig or ice plant (Carpobrotus edulis) flowering along the base of the dunes. Tresco, Isles of Scilly, United Kingdom. May.

David Woodfall / M50 motorway bridge, with River Severn and surrounding flood plain during February 2014 floods, near Upton Upon Severn Worcestershire, England, UK, 7th February 2014.

Gavin Hellier / Heavy traffic on the Pasadena Freeway, CA Highway 110, leading into downtown Los Angeles, California, USA, June 2011