Guido reports that the National Oceanic & Atmospheric Administration have solved the problem of not being able to explain what's causing the earth not to warm despite their computer models predicting death and destruction by now by "proving" that the earth is warming. They've done this by altering the temperature data from before 1998 to say that it was colder and the temperature data since 1998 to say that it's warmer even though we can see for ourselves that the temperature isn't rising!
And if all others accepted the lie which the Party imposed – if all records told the same tale – then the lie passed into history and became truth. "Who controls the past," ran the Party slogan, "controls the future: who controls the present controls the past." And yet the past, though of its nature alterable, never had been altered. Whatever was true now was true from everlasting to everlasting. It was quite simple. All that was needed was an unending series of victories over your own memory. "Reality control," they called it: in Newspeak, "doublethink.
- George Orwell, 1984