Amnesty International isn't widely known for its contributions to the environmental debate, but a current post on Human Rights Now, the blog of Amnesty International USA, shows an arresting image of the impact of oil spills in the Niger Delta region of Nigeria over the past five years.
On the right-hand side is a false-colour image from December, 2006, showing the waterways around Bodo, Nigeria, in which healthy vegetation appears bright red. On the left is a continuation of the same river, dating from January, 2009, but this time with no healthy vegetation remaining - an oil spill has killed growth along the river.
According to Amnesty's blog, two major oil spills in the Niger Delta in 2008, which gushed for weeks before they were stopped, devastated the lives of tens of thousands of people, destroying livelihoods, undermining access to food and clean water and putting health at risk. It also seems to have made for arresting, if disheartening, imagery.