"Port Arthur, Tex. -- The Valero oil refinery looms over the small streets of this blighted port city. A vast maze of pipes and vats and boilers, the refinery traces its rootsback 111 years, to just months after the historic Spindletop gusher that triggered the Texas oil rush."

"BLOOMING GROVE -- On one side of a gravel road in Navarro County, an overgrazed pasture has been cropped to the dirt. Across the road, a surviving patch of Blackland Prairie that has been reseeded with native grasses is covered with a cornucopia of 170 plant species that together comprise prime habitat for bobwhite quail -- if only they could get there."

"AUSTIN -- Exxon Mobil Corp. has reported inadvertent emissions of large amounts of pollutants at its flagship refinery near Houston."

"For decades, cowboys known as 'tick riders' have patrolled the U.S.-Mexico border to prevent cattle carrying 'fever ticks' from entering."

"OKLAHOMA CITY (AP) — High temperatures and an ongoing drought are having an impact on more than just crops and livestock. State health officials say they are also creating ideal conditions for the growth of a tiny, single-cell organism that lives in Oklahoma's rivers, lakes and ponds and can cause a disease that is almost always fatal."

"The Canadian pipeline company TransCanada has quietly begun construction of the southern leg of the controversial Keystone XL pipeline, installing segments near Livingston, Texas, company officials confirmed Thursday."

"The Arizona city already logs more days over 100 degrees than any U.S. city, and climate researchers predict Phoenix will grow hotter still in the coming decades. Planners are taking the projections seriously, and are looking for ways to adapt the city and its residents to a hotter, drier reality."

"DALLAS - Suffering from the nation's deadliest outbreak of West Nile virus this year, Dallas County authorized aerial spraying of insecticide on Friday for the first time in nearly five decades to help fight the mosquito-born illness."