President Obama unveils plan for reducing carbon pollution in a speech at Georgetown University.
Watch live, broadcast via NBC News on June 25.
[US President Barack Obama speaks at the southern site of the Keystone XL pipeline in March 2012 in Cushing, Oklahoma. A Canadian firm has reapplied for a US permit to build a multi-billion dollar Canada-US oil pipeline, after its first proposal was rejected over environmental concerns, both sides said Friday. (AFP Photo/Tom Pennington)]