These are all blogs from friends of mine, really worth a read.
This an amazing blog tackling great issues, bringing you up to date with anything from the fields of conservation through to animal welfare.
MAD AS A MARINE BIOLOGIST
Another cracking blog with links to many others. Conservation issues and great photography inside.
TAKE NOTHING BUT PHOTOS
Serious stuff, real issues that are close to the authors ( and my) heart.
Marine conservation and biology. Really good reading
THE IRRATIONAL MAN
Conservation and sustainability well covered.