Global warming 

The Muller Berkeley Earth ​​study computed the greatest number of land surface temperatures ever recorded, and showed that the global land surface temperature has increased by 1.5 degrees C over the past 250 years. The increase has slowed in just the past few years.

Interestingly a 2013 paper Monitoring European average temperature Warming in Europe finds it is accelerating. 
For world food security and Arctic methane feedback what natters most is the summer Arctic and N. hemisphere, which have warmed a lot this past decade compared to a few decades ago.

Large regions of NH food production and permafrost are warming fast.​​
One big reason for the temperature increase slowing is the large increase in fossil fuel air pollution from Asia, particularly China confirmed by a 2011 paper Reconciling anthropogenic climate change with observed temperature 1998–2008, ​​​​​​​​​​​​​​​​well explained here.  

​​A 2013 re-analysis ​​​study of ocean warming Distinctive climate signals in reanalysis of global ocean heat content (2013) has found extraordinary recent warming of the deep ocean. This rate of deep ocean warming may be unprecedented and it is associated with less heating of the surface ocean. As the surface of the planet is mainly water this indicates planetary warming in fact may have accelerated. 

A 2013 computer model research paper​ finds that "Strengthening of ocean heat uptake efficiency associated with the recent climate hiatus" and that is inherent in the climate system opposite to the models

A Sept 2013 Review ​of global ocean temperature observations: Implications for ocean heat content estimates and climate change "The total energy imbalance at the top of atmosphere is best assessed by taking an inventory of changes in energy storage. The main storage is in the ocean, the latest values of which are presented. Furthermore, despite differences in measurement methods and analysis techniques, multiple studies show that there has been a multidecadal increase in the heat content of both the upper and deep ocean regions, which reflects the impact of anthropogenic warming. With respect to sea level rise, mutually reinforcing information from tide gauges and radar altimetry shows that presently, sea level is rising at approximately 3 mm yr−1 with contributions from both thermal expansion and mass accumulation from ice melt."
Regional Warming

​We must consider the temperature change of different regions to assess global warming danger.

The NASA map of the trend of summer warming for the past decade shows fastest warming over a third the US below the Great Lakes, Canada permafrost, Eastern Europe and Russia (high food production) and a huge region of Siberian permafrost

Arctic warming​
​​​​The most important region by far is the Arctic - because ​​​​of all the carbon the Arctic holds, till now safely cold and frozen. In the case of the Arctic the temperature increase has not stalled- it has gone on increasing at a rapid rate. Now the Arctic is warming 3X the global average. That means increasing Arctic methane emissions, and also CO2 and nitrous oxide. This increased warming of the Arctic is what matters most because it can lead to the planetary catastrophe of GHG feedback rapid global warming and runaway climate change.​​
While the temperature increase may have slowed to 2012, the decade was the warmest ever.
Increased Radiative forcing (total heat in the climate system) correlates directly with the total increase in atmospheric GHGs. The NOAA converts the two into a GHG Index which provides a measure of the increase in GHG heat in the whole climate system. It is the best single index of warming to use. 

Warming cannot stop because today's extreme high atmospheric GHGs has double today's global temperature in ​the climate system that has not registered yet. 

The Health and Human Rights Approach to Climate Change

PNAS 2011 Asian air pollution cooling

June 2015 latest research shows no pause

​2014 was a record year for global warming, and the indications are that global warming is speeding up.

The different rates of warming in different regions ​is marked and projected to increase.

The Arctic is warming fastest which is a planetary emergency because the largest sources of carbon which release more carbon with warming - are in the Arctic.

Next comes Europe and N> America, a planetary emergency- the world's best food producing regions, where heat waves and drought are increasing   ​​​​ 
from J. Hansen 2015  2014 warming ​
Recent Research 
June 2015 Possible artifacts of data biases in the recent global surface warming hiatus
  • Warming of the climate system is unequivocal
  • Human influence on the climate system is clear​
  • ​Recent climate changes have had widespread impacts on human and natural systems.
    IPCC AR5 2014 Headline Statements​
List of scientific organizations with statements
​NASA July 2015
 This is global mean (land-sea) surface temperature increase, which rpresents only a very snall part of the heat being added to biospehere from greenhouse gas emissions accumuating in the atmopshere