The problem is, there are very few sources of information on the tracks in Rio.
Almost half of all energy coming from renewable sources, mainly hydroelectric but also biofuels.
Human sources come principally from the burning of fossil fuels such as coal, oil and gas.
New sources of revenue will have to be developed and no single one will be the answer.
There are two sources of loans as I indicated earlier, the federal government and the private banks.
Sources are also predicting a tightening of the qualifications required to set up as a child minder.
The answer, I am told by government sources, is firmly negative - for reasons of practice and principle.
The sources told BBC Arabic that Mr Alhouraysi's family is refusing to receive his body from the hospital.
In this high-tech information age few look to the most basic industries as sources of national economic power.
Sources close to the governor say Christie has made no decisions because it's so early in the process.
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Coombs contended Manning chose information he knew would not identify diplomatic or intelligence sources by name.
We are guided by our individual consciences, molded by personal sources of influence and inspiration.
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They are also targeting 25% of their electricity to come from renewable sources by 2015.
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Steven has helped us to speed the transition to more sustainable sources of energy.
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In addition, as you search, you create relationships between different sources of big data.
She cited unnamed law enforcement sources, a practice that is customary in investigative journalism.
Legal sources said it may be a year before Mr Montgomery's case comes before the court.
The next generation will not be held hostage to energy sources from the last century.
Today's high-definition sources are scrunched down with MPEG-2, a long-lived standard also used by DVDs.
Governments are finding it almost impossible to monitor, let alone isolate, so many sources of infection.
But what I've also said is we can't just produce traditional sources of energy.
That means investing in clean, alternative sources of energy, like advanced biofuels and natural gas.
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The Palestinian sources said an 18-year-old and a 19-year-old were killed and two others were hurt.
To attract different sources of money, the industry may need to offer different structures.
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What obscure sources could the Russians be using to come to such a wacky conclusion?
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What do you hear when you call your sources at the Pentagon and elsewhere?
Biofuels are more environmentally friendly than petrol or diesel because they come from renewable sources.
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The amount is extremely small and less than 1% of all other natural sources of radiation.
Currently, demand is high and the price of oil is controlled by foreign sources.
The Art Newspaper quoted sources saying the London-based Russian billionaire was the buyer of both paintings.
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