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A car struck three "Occupy DC" protestors blocking traffic outside an event at the DC Convention Center, where two GOP presidential candidates were honoring the anti-environmental Koch brothers. The protestors were ticketed for blocking traffic and sent to the emergency room, while the driver who struck them was not charged. Accounts of the incident differed. Protestors said the driver sped up to plow through two different sets of protestors. Police said that the protestors jumped in front of a moving car and that they released the driver because he had a green light when he hit them.

"Thousands of protesters opposed to a new oil pipeline from Canada to the United States circled the White House grounds on Sunday to press President Barack Obama to reject the project for environmental reasons.

Opponents to TransCanada Corp's Keystone XL pipeline, which would transport crude produced from oil sands, have dogged the president for months, arguing that the carbon emissions produced in the process of extracting oil from the sands would exacerbate climate change.

"WEST LAFAYETTE, Indiana -- An ant species common to the mainland United States that is known for its tropical smell has invaded Hawaii for the first time. A population of odorous house ants, Tapinoma sessile, has been found at an upland site on the island of Maui. Also called stink ant, and coconut ant, these ants got their names because they invade houses and smell like coconut when smashed."

"The global output of heat-trapping carbon dioxide jumped by the biggest amount on record, the U.S. Department of Energy calculated, a sign of how feeble the world's efforts are at slowing man-made global warming."

"Efforts to reduce pollution of the Chesapeake Bay are starting to pay off, a major new study says, finding that despite weather-driven ups and downs, the 'dead zone' that stresses fish and shellfish every summer has actually shrunk, on average, in recent years."

"BP has agreed to pay a record $50 million fine to Texas for unlawful releases of air pollution during and after the deadly explosion at its Texas City refinery in 2005."

"Over the protests of its Democratic minority, a House subcommittee voted on Thursday to authorize the chairman of the Energy and Commerce Committee to subpoena documents from the White House related to the solar manufacturer Solyndra."

"The U.S. Environmental Protection Agency says it will take steps to remove 20 rodent control products from the marketplace because they contain toxic chemicals."

"The Environmental Protection Agency on Thursday released the outlines of its long-awaited probe into whether hydraulic fracturing -- the unconventional drilling technique that's led to a boom in domestic natural gas production -- is contaminating drinking-water supplies. Investigators will try to determine the impact of large-scale water withdrawals, aboveground spills of drilling fluids, and the fracturing process itself on water quality and quantity in states where tens of thousands of wells have been drilled in recent years."