In December 2009, President Obama and other world leaders came together to negotiate the Copenhagen Accord, an important milestone in which, for the first time, all major developed and developing economies agreed to implement measures to limit their greenhouse gas emissions and to do so in an internationally transparent manner. In 2010, the Cancun Agreement confirmed and substantially extended the core elements of the Copenhagen Accord in the areas of finance, technology and adaptation as well as mitigation and transparency in an instrument that the Parties enthusiastically endorsed.

In December 2011 at Durban, the United States and the international community took important steps to make operational all of the key elements of the Cancun agreement, including a transparency regime to monitor and review mitigation efforts by developed and developing countries, as well as established a Green Climate Fund. In addition, a process was launched to negotiate a new legal instrument to take effect from 2020, and U.S. leadership was crucial to ensuring that the instrument will be applicable to all parties and include all of the major economies within a common legal system.

The Major Economies Forum on Energy and Climate, launched by President Obama in April 2009, facilitates a candid dialogue among major developed and developing economies to make progress in meeting the climate change and clean energy challenge. The 17 major economies which are members of the Major Economies Forum are: Australia, Brazil, Canada, China, the European Union, France, Germany, India, Indonesia, Italy, Japan, Korea, Mexico, Russia, South Africa, the United Kingdom, and the United States.

The Clean Energy Ministerial, announced by President Obama and the Leaders of the Major Economies Forum on Energy and Climate, and led by Energy Secretary Chu, has made progress towards its goal of driving transformational low-carbon, climate friendly technologies by providing tools and platforms to improve the policy environment for energy efficiency, renewable energy, and clean energy access.

In February 2012, the United States launched the Climate and Clean Air Coalition to Reduce Short-Lived Climate Pollution, a new global initiative to make rapid progress on climate change and air quality. Reducing pollutants that are “short-lived” in the atmosphere, such as methane, black carbon, and hydrofluorocarbons (HFCs), which together account for one-third of current global warming, can prevent more than 2 million premature deaths a year, avoid the annual loss of over 30 million tons of crops, increase energy security, and address climate change. Since its launch, the Partnership has expanded beyond the original founding partners (Bangladesh, Canada, Ghana, Mexico, Sweden, and the UN Environment Program) to include over 30 countries and the European Commission.

At the 2011 Asia-Pacific Economic Cooperation (APEC) Summit chaired by President Obama in Honolulu, leaders agreed to eliminate non-tariff barriers to environmental goods and services, including local content requirements, and cut applied tariffs on such goods and services to 5 percent by 2015. This will help lower costs, increase the dissemination of clean technologies, and create jobs. Leaders further committed to phase out inefficient fossil fuel subsidies and aimed to reduce the energy intensity of APEC economies by 45 percent by 2035.

For the past four years, the United States has led international efforts to amend the Montreal Protocol to phase down global production and consumption of hydrofluorocarbons (HFCs), a potent greenhouse gas. A global phase down of HFCs could potentially reduce some 90 gigatons of greenhouse gases by 2050, equal to roughly two years worth of current global greenhouse gas emissions. In June 2013, President Obama and Chinese President Xi agreed to work together and with other countries to use the Montreal Protocol to phasedown HFCs, a critical step forward toward a global agreement.