U.S. President Barack Obama addressed the United Nations Climate Change Conference this morning in Copenhagen. While his speech was highly anticipated as a possible turning point in the negotiations of a comprehensive global climate treaty, it was more of a call to action than a defining moment.

"Our ability to take collective action is in doubt," Obama said (watch video of the speech below).

The two-week COP15 is now in overtime meetings as leaders work to establish some sort of agreement, though likely not as substantial as we've been hoping for.