New Delhi: Climate demon El Nino is back in news again. After being blamed for creating an abnormal warming of ocean waters in the tropical Pacific, scientists have found El Nino accountable for another occurrence. A recent study has found that it is responsible for the unrest in poor countries.

The poor countries which are impacted by El Niño are victims of civil war. The study says that the effect of the climate is responsible for political and social instability in such nations. Apart from the United States, the countries which are affected by El Niño are victims of civil war.

According to the study, there is a significant increase in unrest during the years of an El Nino, which is a regular climatic event that tends to warm up and dry out tropical regions.

"When people get warm and uncomfortable, they get irritable, they are more prone to fight," said Mark Cane, a professor of Earth and climate sciences at Columbia University and co-author of the study.

"People do like to fight and El Niño conditions help."

The flip side of El Niño, a La Niña, is also the most peaceful time for these tropical countries, the research found. Meteorologists predict the world is heading into another La Niña.

The researchers say the increase in civil unrest during an El Niño is so noticeable that there is more than just a link, but a partial cause. They say that El Niño influenced 48 of 234 civil wars or uprisings between 1950 and 2004.

For example, they point to internal strife in Chad, Congo, Eritrea, Indonesia, Rwanda, Myanmar and Niger during a strong El Niño in 1997.

The weather effects of an El Niño, which warms the central Pacific Ocean, are felt the most in about half the world, chiefly in the tropics, not including the United States or Europe. And it's in those mostly poor nations where the scientists noticed El Niño's affect on internal conflict.