The Berkeley Earth Project graph is displaying incomplete statistical data to conveniently prove their point (or guarantee their government grant for another year). Why are they only showing data from 1950 to the present day, would it have something to do with previous years data showing that the Earth's natural temperature is cyclical and has gone up and down many times before.
Here's the graph expanded, you will notice the red line which is the University of East Anglia's Climate Research Unit who were found to have been manipulating data to bolster their own argument in 2009.

Graph by Roy W. Spencer a climatologist and a Principal Research Scientist for the University of Alabama in Huntsville, as well as the U.S. Science Team Leader for the Advanced Microwave Scanning Radiometer (AMSR-E) on NASA’s Aqua satellite. He has served as senior scientist for climate studies at NASA’s Marshall Space Flight Centre in Huntsville, Alabama.
As for getting a Nobel Prize for proving AGW has had no effect, no one has received a Nobel Prize for proving it does exist either. Al Gore and the IPCC (Intergovernmental Panel on Climate Change) received their Nobel Peace (not Physics) Prize for "their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change." Plus all the errors in Nobel winner Al Gore's film "An Inconvenient Truth" used. Here's a few, "Lake Chad drying up” - But it also dried up in 8500BC, 5500BC, 1000BC and 100BC. "Thermohaline circulation stopping” - In reality, it is strengthening. "Arctic warming fastest” - It’s actually 1 degree cooler now than in 1940. "West Nile virus in the US spread through ‘global warming’” - West Nile virus flourishes in any climate, from desert to ice. "Sahara desert drying” - In the past 25 years, the Sahara shrunk by 300,000 square kilometres due to increased rainfall. There are many others too, over 30 used to spread fear amongst the real tin foil hat brigade.
Although Nobel Prize winning Physicists do resign from the APS (American Physical Society) in disgust over its officially stated policy that "global warming is occurring." -
http://www.ibtimes.com/articles/214181/ ... ist-re.htm
Evidence for AGW can only be global climate data with a visible and causal human signal and there has never been any global climate (temperature) data with a visible causal human signal in any IPCC report. As mentioned here by Chris de Freitas, Associate Professor, School of Geography, Geology and Environmental Science, University of Auckland: "There is evidence of global warming. ... But warming does not confirm that carbon dioxide is causing it. Climate is always warming or cooling. There are natural variability theories of warming. To support the argument that carbon dioxide is causing it, the evidence would have to distinguish between human-caused and natural warming. This has not been done."
But anyway back to Attenborough's series. Loved the very intelligent Killer Whales working as a team to solve a complex puzzle of how to get the seal off the ice.