Average world temperatures could rise by anything up to 4 degrees centigrade.

世界平均温度可能会上升摄氏4度。

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On average, world temperatures have risen by about half a degree (Celsius) over the last 100 years.

过去一百年间世界各地的气温平均上升了半度(摄氏度)左右。

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It's true that scientists don't know exactly how much world temperatures will rise if we persist with business as usual.

的确，科学家并不能准确地得知，如果我们一切照旧行事，世界的气温将会上升多少。

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The head of the World Meteorological Organization,Michel Jarraud, said most areas of the world had above normal temperatures in 2009.

VOA: standard.2009.12.09

But while in the last decade - thanks largely to China - CO2 levels have continued to rise dramatically, world temperatures most definitely have not.

BBC: Global warming: Andrew Pendleton and James Delingpole

Faced with melting polar ice caps and worsening droughts, climate experts at a massive U.N. conference in Bali, Indonesia, urged quick action toward a new international pact that seeks to stem an increasingly destructive rise in world temperatures.

NPR: Climate Experts Mull Payment to Stop Deforestation

In the real world, global temperatures have risen merely 0.2 to 0.3 degrees Celsius since 1990.

FORBES: Global Warming Alarmism Continues To Backfire