The US National Oceanic and Atmospheric Administration has recently released a report entitles State of the Climate 2009, which is downloadable in its entirety as a pdf from here, with a web page summarising the report available online here.
The findings of this report, which involved over 300 scientists from 48 countries around the world are further corroboration of the evidence that ‘t the past decade was the warmest on record and that the Earth has been growing warmer over the last 50 years.’ What is interesting about the report, is that it uses a methodology which is well suited to examining a broad range of climactic indicators to build a fairly comprehensive overview of numerous ecological systems and so to be able to map the changes these systems are currently undergoing.
Based on comprehensive data from multiple sources, the report defines 10 measurable planet-wide features used to gauge global temperature changes. The relative movement of each of these indicators proves consistent with a warming world. Seven indicators are rising: air temperature over land, sea-surface temperature, air temperature over oceans, sea level, ocean heat, humidity and tropospheric temperature in the “active-weather” layer of the atmosphere closest to the Earth’s surface. Three indicators are declining: Arctic sea ice, glaciers and spring snow cover in the Northern hemisphere.
By utilising a broad range of indicators, and finding such broad agreement between them the NOAA report provides a good example of the way in which the science behind anthropogenic climate change is based on a vast array of observations which corroborate with the physics behind the greenhouse effect, which gives a causal mechanism to the observations seen in these global climactic systems.
As John Cook from SkepticalScience points out in an article for the Guardian, this kind of rigorous scientific research which seeks to give a good overview of global systems by combining and comparing the observed data for numerous global systems is diametrically opposed methodologically to the kind of material promoted by most climate change skeptics, who seek to prevent meaningful action being taken to reduce the severity of ACC by entirely ignoring the bigger picture – the enormous breadth of data from global systems – instead focusing on minute details such as the choice of proxies used in decade old papers on paleoclimatic reconstructions (the repeatedly vindicated Hockey Stick paper published by Mann Hughes and Bradley) or the choice of wording in private emails between climate researchers (such as Phil Jones’ phrase ‘hide the decline’ to describe the divergence between one particular set of trees used as as a climate proxy and the observed temperature record, which was covered in the published literature on that proxy set).
As the NOAA report highlights, when you look at the big picture, rather than concentrating on minute details, the evidence is that the planet is heating up, that human activity is largely the cause, and that the medium to long term ramifications of these changes will make life far harder for hundreds of millions of people as well as causing the extinction of innumerable other species less capable of adapting to a changing climate. As time goes by and more research is being done, that evidence is only getting stronger as more and more datasets which confirm the findings of the IPCC emerge. However despite this mountain of evidence, the political action that would make meaningful action to mitigate the worst of the potential consequences is still a long way off, with the US Senate’s decision not to even try to get a massively compromised bill through following in the wake of the inability of the world’s political leaders failure to reach any deal at COP15 in Copenhagen last December to succeed the emissions cuts of developed nations agreed under the Kyoto Protocol. With the US seemingly steadfast in its refusal to make any kind of cuts to its emissions, it seems unlikely that other developed nations are going to volunteer further reductions to their own emissions, no matter what the science says, as politicians are too fearful for their own careers, which are largely dependent on short term economic success rather than longer term sustainability.