The Weather Report

http://www.economist.com/news/finance-and-economics/21594252-economists-are-getting-grips-impact-climate-change-weather

This article discusses the economic impact of global climate change. It compares how developed countries are affected versus less developed countries, and it discusses the correlation between countries with higher median temperatures and their economic output. The article cites multiple studies that show there is a negative correlation between temperature and economic output.  Melissa Dell of Harvard University, Benjamin Jones of Northwestern University and Benjamin Olken of the Massachusetts Institute of Technology found that for every 1 degree Celsius increase, GDP is 8.5% lower. They noted that this does not mean that if global temperatures raised by 1 degree Celsius, that GDP would would lower by 8.5% across the world. This shows that there are external factors causing lower economic outputs in areas where there also higher temperatures. Unfortunately, the article does not go into depth discussing possible factors that could be causing the decreased economic output. 

The article also notes that the relationship between temperature and economic output is not linear. This means that an increase from 22 to 23 degree Celsius may not have an effect on economic output, but an increase from 35 to 36 degrees Celsius may have a significant affect on a country's economic output. Less developed countries typically rely more on agriculture for there economy, and agriculture is negatively affected by extremely high temps and droughts. Thus, less developed countries typically feel the impact of global climate change more so than developed countries. 

I think the most effective way to examine the difference in how less developed countries and developed countries are impacted by global climate change is by studying two countries of different levels  of economic development that have experienced similar weather patterns.