Skeptics argue,however, that rising temperatures and warmer oceans are part of a natural cycle and are not convinced the changes are a result of man's pollution.

VOA: standard.2009.05.03

It is not clear what it will be able to do to help revive energy talks with Uzbekistan, Kazakhstan and Turkmenistan, During negotiations in the Czech capital,Prague, the three natural-gas producing nations were not convinced by E.U.offers of more trade and stronger transport links in exchange for their participation in a multi-billion-dollar gas pipeline, known as Nabucco.

VOA: standard.2009.05.11

The apparently victorious Mr.Yanukovich has pledged to tackle corruption and improve living standards, but not everyone is convinced, including student Andrej Suran,23.

VOA: standard.2010.02.14

"This is what the Palestinians are convinced Obama has not shown in the past 18 months.

VOA: standard.2010.05.03

Not all of the families of the British victims are convinced that Abdel Basset al-Megrahi was responsible for the worst-ever terrorist incident on British soil.

VOA: standard.2009.08.21

Bacevich says the Obama approach is more pragmatic than the Bush plan was, but he is not entirely convinced that it is different enough to work.

VOA: standard.2009.03.27

Still,not everyone here is convinced that American missile defense is so important.

VOA: standard.2009.10.22

Ms.Tymoshenko said in a televised appeal to the nation Saturday she is convinced her rival, Victor Yanukovich, who seeks closer ties with neighboring Russia, had not won the presidential election.

VOA: standard.2010.02.14

This is presidential historian and author Robert Dallek: "Once the public turns against a war, once it is convinced that you are embarked upon if not a losing enterprise then something that is going to produce a quagmire, it creates tremendous political difficulties for the president and it undermines his credibility, trust in his judgment and his ability to put across his domestic reforms,"

VOA: standard.2009.10.09