Records are made to be broken but should be done naturally and without doping and steroids. The 2012 heat record for the lower-48 states smashed the warmest year record for the contiguous USA by a full degree Fahrenheit. http://www.ncdc.noaa.gov/sotc.
What happened with the 2012 heat record would be like Bolt shaving a full second of the 100 meters sprint record. And that would not be natural.
Here is another data point driving home just how hot 2012 was. Last year was 3.2 degrees warmer than the 20th century average, again according to NOAA.
The climate is on steroids. It has changed already. Seas and temperatures are already up and going up further, as more heat trapping gas is pumped into the atmosphere.