The main activity of the UN's Intergovernmental Panel on Climate Change is to publish regular reports on the state of knowledge about climate change.

The United Nations Security Council passed a resolution regarding Syrian chemical weapons on September 27, 2013.

Department of the Treasury Assistant Secretary Marisa Lago delivered these remarks at the Seminar on the U.S. Regulatory and Institutional Environment for Chinese Foreign Direct Investment on September 25, 2013.

President Barack Obama delivered this speech before the UN General Assembly on September 24, 2013.

Iranian President Hassan Rouhani delivered these remarks at the UN General Assembly on September 24, 2013.

The United Nations Mission to Investigate Allegations of the Use of Chemical Weapons in the Syrian Arab Republic submitted an investigative report to UN Secretary-General Ban Ki-moon on Sunday, September 15, 2013. This "Report on the Alleged Use of Chemical Weapons in the Ghouta Area of Damascus on 21 August 2013" concludes that "chemical weapons were used on a relatively large scale, resulting in numerous casualties, particularly among civilians and including many children."

Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov developed a joint strategy to remove Syria's chemical weapons arsenal by "the first half of 2014." The agreement was reached on September 14, 2013, during the third day of their meeting in Geneva.

Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov met in Geneva on September 12, 2013, to discuss the possibility of Syria handing over its chemical weapons to the international community. This approach was proposed as an alternative to a military strike as a response to the August 21 chemical weapons attack in Damascus.

President Obama spoke to the American public on September 10, 2013, about the U.S. government's response to the Assad regime's use of chemical weapons. He requested Congress to delay its vote on the proposed military strike, in order to address Russia's proposal of Syria handing over chemical weapons to the international community.

On the margins of the G20 meeting in St. Petersburg, September 5-6, 2013, leaders from Australia, Canada, France, Italy, Japan, Republic of Korea, Saudi Arabia, Spain, Turkey, the United Kingdom and the United States of America released a joint statement condemning the use of chemical weapons in Syria.

The leaders of the G20 met in St. Petersburg September 5-6, 2013, to discuss the global economic development and regulation, energy policy, climate change initiatives, and corruption.

President Obama spoke at a Press Conference during the G20 Summit in St. Petersburg on September 6, 2013. He discussed the state of the global economy and international response to Syria.

On September 4, 2013, the U.S. Senate Committee on Foreign Relations debated the resolution: "Authorization for the Use of Military Force Against the Government of Syria to Respond to Use of Chemical Weapons."

Secretary of Defense Chuck Hagel, Secretary of State John Kerry, and General Martin Dempsey testified before the Senate Committee on Foreign Relations on September 3, 2013, regarding options for U.S. military operations in Syria.

The French Government released its declassified assessment of the August 21 chemical weapons attack in Syria.

President Barack Obama gave this statement on August 31, 2013, to explain his decision to pursue military intervention in response to the August 21 chemical weapons attack in Damascus.

The U.S. government released this assessment on August 30, 2013, to provide declassified details about the August 21 chemical weapons attack in Damascus.

Secretary of State John Kerry gave this statement on August 30, 2013, to review with the American people the Obama administration's assessment about the August 21 chemical weapons attack on Syrian civilizans and the steps taken to develop a plan with U.S. and international officials to intervene.

The government of the United Kingdom published its position on August 29, 2013, about the legality of military action in Syria after the chemical weapons attack in Damascus on August 21.

President Barack Obama gave these remarks on August 28, 2013, at the Lincoln Memorial, marking the fiftieth anniversary of Dr. Martin Luther King, Jr.'s "I Have a Dream" speech at the first March on Washington for Jobs and Freedom.