But against the backdrop of war in Iraq , instability across the Middle East , growing debate about the world 's oil supply and the threat of global warming , environmental groups say that there are several reasons for the United States to require cars and trucks to burn less gasoline .
Middle East /location/location/contains Iraq
CC IN DT NN IN NN IN NNP , NN IN DT NNP NNP , VBG NN IN DT NN POS NN NN CC DT NN IN JJ NN , JJ NNS VBP IN EX VBP JJ NNS IN DT NNP NNPS TO VB NNS CC NNS TO VB JJR NN .
Middle East
LOCATION
Iraq
LOCATION
/location/location/contains