Well, how much is the basis of the oceanic foodchain worth to us?  Coral reefs are dying in the warming seas http://www.w3ar.com/a.php?k=548, exacerbated by increased UV from ozone depletion, of course.  Either way, doesn't matter much, we humans are pretty unconcerned with our mode of destruction, s'long as we kill as much as possible.

Not to mention plankton, down by 30% in one study - http://www.gsfc.nasa.gov/topstory/20020801plankton.html

Which, in concert with deforestation, may rob us of our breath - http://www.truehealth.org/oxydecl.html

How much is that worth?

may rob us of our breath

How about this breath robbing:
http://www.safe2use.com/ca-ipm/01-02-05-report.htm

a particular engineered bacterium that had been approved by the USEPA for field testing.
These bacteria would therefore get into the root systems of all terrestrial plants and begin to produce alcohol. The engineered bacterium produces far beyond the required amount of alcohol per gram soil than required to kill any terrestrial plant.

Where can you get these bioengineered yeast organisms? They would be a boon for alcoholics! No distilling needed to make vodka from switchgrass. The advantage is that as more people will want to drown their sorrows, they can cultivate their own drinkable E85 and it placates the teeming masses by getting them too drunk to care about anything. Could THIS be the best use of ethanol?
Where can you get these bioengineered yeast organisms?

Hopefully, one can't go out and obtain the bacteria.

No distilling needed to make vodka from switchgrass.

Vodka is defined as being at least 40% ethyl alcohol.   I know of no way to obrain such a level w/o distillation.

placates the teeming masses by getting them too drunk to care about anything.

The problem is, untill you die, you can eventually sober up.

But killing more is Good.