In 2009, countries around the world gathered in Copenhagen with pledges to reduce greenhouse gas emissions that fuel climate change. But a recent study paints a disappointing picture of progress: lots of promises, not much follow-through. Have many countries abandoned their climate commitments?

The 2009 Copenhagen Summit, formally known as the 15th session of the Conference of the Parties ( COP15 ) to the United Nations Framework Convention on Climate Change ( UNFCCC ), was a critical event with high expectations for the advancement of global climate policy.

The summit brought together leaders and delegates from around the world to create a comprehensive and legally binding agreement to significantly reduce global greenhouse gas emissions. (Sanjana Gajbhiye, more at earth.com)