If you think there's too much CO2--a doubtful proposition--plant a tree.
It's doubtful that the heavy-duty psychiatric drugs are better than over-the-counter Benadryl for treating insomnia, says George Simpson, a psychiatrist at the University of Southern California.
Can you give Arsenal a nine-point lead, it's very doubtful, though when Alex gets them all back - Rio, Wayne Rooney and Louis Saha - they'll go on a run and they won't lose that many games.
The 30-year-old is doubtful for the Republic of Ireland's Euro 2012 qualifier against Macedonia in March.
The steel industry is another where the logic of mega-mergers is doubtful.
Even if the Treasury wanted to hand over spending power, it's doubtful that the private sector-led replacements for RDAs are up to the job of handling all that cash, or of strategic regeneration decisions.
But the Scottish secretary's job, which will be of doubtful value once all law-making and spending responsibility has been passed to the Scottish parliament, looks to have been made completely redundant by the new committee.
But whether the idea of Italy's debt being "mutualised" (or shared with German taxpayers) via some kind of shield provided by the IMF will appeal to the German parliament and German central bank - which are set against any such central-bank lending to any eurozone member state - seems highly doubtful.
House Republicans have discussed pushing a Medicaid per-person spending cap next year as a possible compromise to the Medicaid block grant proposal in the House-passed budget, according to Rep. Mike Burgess (R-TX), but Democratic lobbyists say it is doubtful Congress could work out a deal in part because per-person caps would create bureaucratic nightmares.
FORBES: Why Block-Granting Medicaid Will Result in Better Health Care for the Poor
The benefits of tight monetary policy are more doubtful, and the damaging side-effects of depreciation less severe.
It is doubtful that the concentration on less-well-known pictures (many of them seldom-seen loans from private collections) will convince people that Bonnard is, as Ms Amory claims, a modernist.
Wall Street analysts were doubtful that Wednesday's drop-dead date for interested suitors of media giant Tribune Co. (nyse: TRB - news - people ) would result in any premium bids for the company, if it's sold at all.
It is doubtful whether even a 100%-fit Fognini could trouble Djokovic, who is showing no signs whatsoever that the pressure is getting to him, or that he is even aware of it, as he continues to cast aside opponent after opponent.
Even if such squeezes made sense economically (which is doubtful), they are political non-starters.
"It's highly doubtful" the Boston bombers used consumer-grade fireworks, said Julie Heckman, executive director of the American Pyrotechnics Association, an industry trade group.
The Queen Charlotte is continuing as a pub in the meantime and is encouraging locals to attend, but long-term sustainability is looking doubtful.
And it is doubtful whether Mr Soros, a left-wing Democrat who has little sympathy with Israel, would be the best patron for such an organisation.
However, with centre-back William Gallas also doubtful having hobbled off against Liege with an ankle injury, Wenger could start Mikael Silvestre, or even move either centre-back Thomas Vermaelen or right-back Bacary Sagna to the left.
The 57-cap international joins Wales captain Craig Bellamy on the doubtful list for Wales' summer games, while West Ham defender Danny Gabbidon is a long-term absentee.
Emerging-economy status, itself of doubtful validity, is nonetheless reserved for countries of negligible economic impact.
General Pace's re-confirmation by Congress had looked doubtful because of the failures in Iraq on his watch.
Hokuyo's solution was to buy two-thirds of Takugin's doubtful loans at a discount.
But other than that, the military, Dover Air Force Base, protecting it against any closing - although, that would be doubtful.
His Gloucester team-mate Luke Narraway is also doubtful for England's first game against the Pacific Islands on 8 November because of a hamstring injury.
The ruthless attention to detail and complicated build means it is very doubtful that it will make them any money - and yet I'm not sure they care all that much.
Computers and VCRs may coas a lot, but it's doubtful that they are a greater burden than one-room school houses were for the cruelly poorer America of 60 years ago.
And even its supporters are doubtful that a coalition with Syriza, a left-wing party led by Alexis Tsipras, a 34-year-old who has never run for parliament, would work.
For Jean Sassus of Raymond James Euro Equities, it's also doubtful that a merger would really result in long-term gains, such as those achieved when Spain's Banco Santander made when it took over Abbey National in Britain.
Centre Mike Tindall (broken leg) and number eight Dan Ward-Smith (knee) are both doubtful for the tournament, while James Forrester (knee) and hooker Steve Thompson, forced to retire because of a neck injury, have already been ruled out.
It's doubtful that Apple will fully open up Siri to third-party developers anytime soon.
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