This is not an Onion article

The American leader, who has been condemned throughout his presidency for failing to tackle climate change, ended a private meeting with the words: "Goodbye from the world's biggest polluter."

He then punched the air while grinning widely, as the rest of those present including Gordon Brown and Nicolas Sarkozy looked on in shock.
[...]
Mr Bush also faced criticism at the summit after Silvio Berlusconi, the Italian Prime Minister, was described in the White House press pack given to journalists as one of the "most controversial leaders in the history of a country known for government corruption and vice".

The White House apologised for what it called "sloppy work" and said an official had simply lifted the characterisation from the internet without reading it.