Mayor Marty Walsh will be taking some time off from trading potshots at billionaire real estate mogul and Republican presidential candidate Donald Trump to meet with Pope Francis at the Vatican as part of a conference to discuss human trafficking and climate change.

Walsh will participate in the Conference organized by the Pontifical Academy of Sciences from July 20 through July 22.

"I am honored to have the opportunity to represent the City of Boston at the Vatican to discuss the vital issues of human trafficking and protecting our environment," said Mayor Walsh. "I look forward to sharing Boston's progress with my peers from around the world and exploring how we can work together to prepare our cities for the future."  

The workshops will bring together mayors, local administrators, and religious leaders from major cities throughout the world to request that the UN consider modern slavery and human trafficking a crime against humanity. The workshops secondary aim is to put pressure on the UN to approve new sustainability goals.

Mayor Walsh has backed ongoing efforts to combat both of these issue areas, saying that he that he is committed to ending human trafficking in the City of Boston. He is among a network of 11 mayors called CEASE, Cities Empowered Against Sexual Exploitation. CEASE Boston targets men who are buying sex on the streets, and those who are using the internet to solicit sex. The program aims to reduce online demand activity by 20 percent, as well as street level activity by 80 percent, over the next two years.

In addition, Mayor Walsh released the Greenovate Boston 2014 Climate Action Plan Update in January to prepare the City of Boston for the impacts of climate change and celebrating the City's progress towards reducing greenhouse gas (GHG) emissions 25 percent by 2020 and 80 percent by 2050.

While in the Vatican, the Mayor will also attend a reception with the U.S. Ambassador to the Vatican, Ken Hackett. Walsh is scheduled to leave the Hub July 19 and return on  July 23.