Before the Iraq war, many groups were screaming that the environmental disasters from the war would be enormous.
Greenpeace posted this on their website:

In addition to the immense human suffering caused by the war, it was arguably the first war where large-scale environmental damage was deliberately used as a form of weapon.
Between six and eight million of barrels of oil were deliberately poured into the Persian Gulf, causing the world' s largest oil spill. The slick, 30 miles long and eight miles wide, caused severe pollution to over 500km of coastline.

Fires from 600 deliberately damaged Kuwaiti oil wells consumed an estimated 67 million tonnes of oil created a blanket of soot, gases and aggressive chemicals which impacted terrestrial and marine systems over the Gulf area.3 This led to immediate respiratory problems in local populations and generated serious long-term risks of birth defects and cancer in exposed people.

Notice they didn't mention who released and burned all that oil.

The Chinese even got in on the act:

From the day-and-night bombing, people can easily remember a scene, in which the communications building at Baghdad was hit by guided missiles with thick black columns of smoke rising into the sky, shading mercilessly off the sunshine. A few small birds flapped away in a great surprise and an Iraqi soldier stood blear-eyed up from heaps of ruins and debris, picking up a pigeon blown to death¡­ The noiseless picture expressed the strong wishes of the Iraqi people for peace and also accused the disastrous catastrophes brought about by the war onto the mankind and the environment.

Iraq is one of the transit spots for migrant birds between African and European continents. Every spring and autumn see groups of migrant birds migrate over the land and sky here. The great expanse of marshland and wetland in the south of Iraq proves to be one of the natural sanctuaries for tens of thousands of water birds in west Asia. However, the merciless fire of war is now swallowing the paradise of birds. According to statistics, over 40 species of rare water birds, crustaceans and mammals extirpated on the land of Iraq ever since the Gulf War in 1991.

Well, it seems that the environment in Iraq is healing because of our liberation efforts:

Over the past few weeks, positive signs of environmental recovery have been emerging from the parched Mesopotamian marshlands. These changes are visible in new satellite images taken in May 2003 and which have been examined by UNEP’s DEWA/GRID-Geneva. They dramatically reveal streams and waterways which have ebbed and run aground over the past decade, surge back to life and drainage canals swollen by an exceptional increase in water flows. Formerly dry areas have been inundated as floodgates are opened, embankments and dykes breached and dams emptied upstream. Heavy rains have also contributed to the rising water levels.

(hat tip to James Taranto and crew)