I agree with Blackmac on this. Look at the data from BOM:

2/11/2011 - Max temp in Newy = 23.0

2/11/2012 - Max temp in Newy = 18.6


Now if we plot this data we can see a trend is developing:



Extrapolating this ahead 50 years we see the real picture:




So in conclusion, the scientists are all wrong, the Earth is actually cooling at a rate of -4.4 degrees per year, resulting in an average temperature of -140 degrees in 50 years time.