Biodiesel from palm oil can produce three times the emissions of conventional diesel oil, according to an analysis by Ecofys.
Equipped with air quality sensors and GPS trackers, the birds are tweeting about the city's dirty air.
Don't get too excited about Shell's stated commitment to the cause.
Houston is home to the nation's largest refining and petrochemical complex, where billions of gallons of oil and dangerous chemicals are stored.
On the five-year anniversary of Japan's nuclear meltdown, we might want to look to our own aging plants.
The attorney general answered questions this week about an investigation into Exxon.
Hint: It's not just because he denies the science.
Too often, your access to fresh air depends on your skin color.
Marco Rubio: "Well, sure, the climate is changing and one of the reasons why the climate is changing is the climate has always been changing."