"With the U.S. Senate poised to begin debate on a bill that would greenlight the controversial Keystone XL pipeline as early as Tuesday, activists and other citizens have barraged the Senate with more than 350,000 petitions opposing the legislation in less than five hours. [Ed. Note: the count surpassed 500,000 a few hours later.]"

"President plans to spend big on green cars and biofuels as Steven Chu says US wants to lead in clean energy technology."

"PITTSBURGH -- As natural gas prices continue to drop, the recent nationwide boom in drilling is slowing. Drillers don't make money if prices go too low — and drilling wells isn't cheap."

"Harry Truman was president the last time we exported more energy than we imported. Now complete energy independence may be within reach as President Obama plans to tap all domestic sources to achieve that goal."

"When US government scientists began sampling the air from a tower north of Denver, Colorado, they expected urban smog — but not strong whiffs of what looked like natural gas. They eventually linked the mysterious pollution to a nearby natural-gas field, and their investigation has now produced the first hard evidence that the cleanest-burning fossil fuel might not be much better than coal when it comes to climate change."

"Pacific Gas and Electric Co.'s old gas lines are riddled with potentially lethal weld flaws, and new welding that the company's crews did during pipeline testing last year is suspect, two veteran welders told state regulators this week."

"An obstacle to greening L.A.'s energy portfolio is the Department of Water & Power's contract with a Utah plant, which requires the city to buy coal power until 2027. The gritty fuel is now stoking controversy over energy policy, environmental damage and how much consumers should pay to kick the habit."