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ASSOCIATED PRESS Newly-appointed science adviser John Holdren discusses geoengineering options as a "last resort" approach to counteracting the effects of global warming.

Happening Now

Feds say U.S. drones have killed four Americans
House Republicans find holes in immigration bill
London attackers shout ‘Allahu Akbar,’ machete man to death

IRS head Lois Lerner, who invoked 5th Amendment, may be compelled to testify
Saudi cleric: Prohibit women from using air conditioning
London attackers shout Allahu Akbar, machete man to death
TUCKER: New cold war over shale gas
Mayor Bloomberg to cabbie: 'I'll destroy your [expletive] industry'
Iran's educated, middle-class and part-time prostitute
EDITORIAL: Mr. Obama and his scandals
Most Americans think the country's lost its moral compass: Gallup poll
White House plotted with Treasury on how to reveal IRS misdeeds
House Republicans find holes in immigration bill

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Happening Now

Feds say U.S. drones have killed four Americans

House Republicans find holes in immigration bill

London attackers shout ‘Allahu Akbar,’ machete man to death