"Unmitigated climate change is likely to reduce the income of an average person on Earth by roughly 23 percent in 2100, according to estimates contained in research published in the journal Nature that is co-authored by two University of California, Berkeley professors", write the Berkeley News. The magazine adds that –

The findings indicate climate change will widen global inequality, perhaps dramatically, because warming is good for cold countries, which tend to be richer, and more harmful for hot countries, which tend to be poorer. “Differences in the projected impact of warming are mainly a function of countries’ baseline temperatures, since warming raises productivity in cool countries,” the researchers write. “In particular, Europe could benefit from increased average temperatures.”