09/24/2012 09:04 am ET Updated Sep 25, 2012

Clinton Global Initiative 2012 Features Obama, Romney, Hillary As Speakers (WATCH LIVE)

Clinton Global Initiative kicked off Sunday with representatives from the worlds of philanthropy, politics and business meeting for three days of sessions aimed at tackling the world's most pressing problems.

The theme of this year's meeting is "Designing for Impact," creating discussion on the development of better tools, interventions and partnerships when it comes to tackling issues such as poverty, health, the environment and more.

This year's speakers include Secretary of State Hillary Rodham Clinton addressing attendees Monday morning, and President Barack Obama and Republican presidential candidate Mitt Romney speaking Tuesday.

U.N. Secretary-General Ban Ki-moon said the "top priority" of the meeting is sustainable development.

"I'm going to sound an alarm to all the leaders," he said. "We are living in an era of insecurity, injustice, inequality and intolerance, and what should we do?"

WATCH live above. See full Clinton Global Initiative schedule here.

Click through the slideshow below to see photos from the Clinton Global Initiative.