Just 1 percent of the world's population controls nearly half of the planet's wealth, according to anew study published by Oxfam ahead of the World Economic Forum's annual meeting.

The study says this tiny slice of humanity controls $110 trillion, or 65 times the total wealth of the poorest 3.5 billion people.

Other key findings in the report:

— The world's 85 richest people own as much as the poorest 50 percent of humanity.

— 70 percent of the world's people live in a country where income inequality has increased in the past three decades.

— In the U.S., where the gap between rich and poor has grown at a faster rate than any other developed country, the top 1 percent captured 95 percent of post-recession growth (since 2009), while 90 percent of Americans became poorer.