A recent economic analysis by researchers at MIT (Massachusetts Institute of Technology), US, has indicated that rising global temperatures may widen the gap between rich and poor, because poor nations will face a more severe economic chill.
After examining worldwide climate and economic data from 1950 to 2003, Benjamin A. Olken, associate professor in the Department of Economics, MIT, concluded that a 1 degree Celsius rise in temperature in a given year reduces economic growth by an average of 1.1 percentage points in the world's poor countries, but has no measurable effect in rich countries.
According to Olken, his research suggests higher temperatures will be disproportionately bad for the economic growth of poor countries compared to rich countries.
The precise reasons why higher temperatures lower economic output are likely to be complex, but Olken's results suggest the importance of temperature's impact on agricultural output.
His data also provide evidence for a relationship between temperature and industrial output, investment, research productivity and political stability.
"The potential impacts of an increase in temperature on poor countries are much larger than existing estimates have suggested," Olken said.
"Although historical estimates don't necessarily predict the future, our results suggest that one should be particularly attentive to the potential impact of climate change on poorer countries," he added.
It has long been observed that hotter countries, such as those in sub-Saharan Africa and parts of Latin America, tend to be poorer than cooler countries in North America and Europe.
The main exceptions are hot, rich Middle East countries with oil reserves and cold, poor Communist or former Communist states like North Korea and Mongolia.
What contemporary scholars have debated, however, is whether climate has a significant effect on a country's economy today or whether it is institutions and policies that now solely drive prosperity.
To conduct their research, Olken and his co-authors used existing data sets of economic growth and productivity - everything from gross domestic product to the rate of publication of scientific papers - and combined them with country-by-country temperature and precipitation data from 1950 to 2003.
Olken and his co-authors conclude that rising temperatures do substantially reduce economic output and growth rates in both agricultural and industrial sectors, but only in countries that are already poor.
Higher temperatures also reduce investment and innovation but, again, only in poor nations.
"Should the future effects mirror recent history, world policy makers should be prepared for a widening gap between rich and poor countries as the globe continues to warm," said Olken.