They hope striking landscapes, portraits and detail shots at the Environmental Photographer of the Year show will coax politicians to act now on climate change.
Chartered Institution of Water and Environmental Management sifted through over 4,500 entries from amateurs and professionals to its show.
Judge Nick Reeves said: "Protecting our environment is our most pressing problem and this event highlights the challenges that face people on an everyday basis.
"I urge ministers to visit the show to help them understand how imperative it is to re-think their approach to climate change ahead of Cancun."
Photographers come from 97 countries including Tajikistan, the Democratic Republic of Congo, Mongolia, Swaziland, Palestine, Latvia and Bolivia.
Florian Schulz won the overall title of environmental photographer of the year with his picture of Munkiana devil rays in Baja California Sur.