Some stunning shots from the environmental photographer of the year awards including this image by Florian Breuer of quiver trees by night in Namibia. Check out +environmentguardian for more.

Luckily, not all trees are sick. Keeping track of the healthy ones is an important part of a project by forestry student Martin Slot, from the University of Copenhagen. Slot hopes to develop a method to help save the ash trees from complete eradication Photograph: Marte Franck/University Post

Photograph: Jae Hong/AP

Trees reflected in an art structure in the Olympic Park as preparations continue for the 2012 Olympics - more photos from the week in wildlife in our gallery.