Former Secretary of State Hillary Clinton sent her daughter an email after the conclusion of a United Nations climate summit that had information later deemed classified by the Department of State.

Clinton sent an email to her daughter, Chelsea, two days after she and President Barack Obama tried to negotiate an international global warming agreement at Copenhagen in 2009. The email was sent to Chelsea’s alias email account under the name, “Diane Reynolds.”

Clinton forwarded Chelsea a Dec. 19, 2009 email from top State Department officials and Obama’s global warming “czar” Carol Browner — a long-time Clinton ally — according to emails released by the State Department Friday.

The emails are completely redacted so it’s unknown exactly what was being sent, but Politico found the notations “indicate the information was classified because it came from a foreign government or pertained to diplomatic exchanges.” Clinton sent the message from her private email account run through a server based out of her home in Chappaqua, New York.

The State Department determined the email was “classified” in October, 2015, so it was not classified at the time Clinton sent it to her daughter. Clinton did, however, send Chelsea the email when it was considered “confidential” by the State Department.

The email was not classified at the time it was sent, and it isn’t scheduled to be declassified until 2024.

Deputy Chief of Staff Jake Sullivan sent the email to Clinton Dec. 19, according to emails released by the State Department last year when the email only contained “confidential” information.

“Wow– you can’t make this up–sorry to have missed all of that! Let me know if you learn anything else,” Clinton responded.

Clinton then forwarded the email to Chelsea with the message “see below.” The State Department later “upgraded” the classification to “classified,” according to Politico.

It’s likely the email relates to the 2009 United Nations climate summit in Copenhagen. Clinton touts participation in the climate talks in her 2016 presidential campaign.

Clinton said the Copenhagen summit was a success because she got China “to sign up to the first international agreement to combat climate change that they’d ever joined.” China made no legally-binding commitment to cut greenhouse gas emissions.

Unfortunately for Clinton, that’s not how most people viewed the Copenhagen summit. Negotiations broke down over disagreements of funding and how much carbon dioxide each country should cut.

In the end, all that was agreed to was a non-binding treaty that did nothing to curb emissions.

The summit was widely regarded as a failure, and even Obama was disappointed in the results.

“I think that people are justified in being disappointed about the outcome in Copenhagen,” Obama told PBS’s Jim Lehrer in 2009,

“What I said was essentially that rather than see a complete collapse in Copenhagen in which nothing at all got done and would have been a huge backward step, at least we kind of held ground and there wasn’t too much backsliding from where we were. It didn’t move us the way we need to,” Obama said.

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