Today we kicked off the inaugural expert event focusing solely on the environment.
400 delegates and Counsellors from around the world descended on Tucson, Arizona where host venue Biosphere 2 is located.
The evening started off with delegate networking and heard welcome speeches from One Young World founders Kate Robertson and David Jones.
Tucson's Mayor Rothschild and University of Arizona's Dean Joaquin Ruiz took to the stage to welcome delegates to Arizona and Biosphere 2.
Below are the highlights from today's events:
Here's a sneak preview of the location of tonight's welcome dinner! pic.twitter.com/TjxLYPjGSV— One Young World (@OneYoungWorld) May 19, 2016