That graph shows a general trend for warming since 1979, the last dip in the graph can hardly be treated as heading into a cooling phase as it has only been sustained for a very short period of time. It is hard to draw meaningful conclusions from anything less than a decadal timescale, especially considering that the sun's output varies on an approximately 11 year cycle (Solar Variation).

Just a quick one as I'm drunk and tired; but our most accurate climate models so far (as quantified by starting them in approx 1870, running them to the present, and comparing results with reality) show that in the absence of anthropogenic forcing (i.e. CO2, aerosol and methane input by humans), we should have in fact experienced cooling over the last decade or so. The fact that we have experienced warming is then even worse than it initially appears.

Also, I am sick of people trotting out 'correlation does not imply causation' argument all the time. Yes, it is true, but in this case there is a clear and proven causal link: increased greenhouse gas emissions enhances the greenhouse gas effect which leads to more radiative energy being trapped in the Earth's atmosphere.

As someone working in this field, I would just like to make some clarifications. The term 'Climate Change' is better viewed as two separate questions: is climate change occurring, and if so, is it due to human influence? The first question is effectively settled; temperatures are increasing and extreme weather events are occurring more frequently. The second question is more complex, although the vast scientific consensus is that it is indeed due to human influence. In particular, the greenhouse effect has been conclusively proven. The slightly-informed seem to misinterpret scientific uncertainty (a very specific term referring to statistical probabilities) with a much more general 'scientists aren't sure if this is true or not'.

It is true that there is a long way to go in climate science. However, this is no reason not to teach it in schools. There are many unknowns in the science (as with any field of science); these should not be understated, but neither should they be overstated - it would not be helpful for teachers to spread yet more excessive doubt. Finally, it is of particular importance that climate science is taught in school - the consequences of climate change are likely to be extremely grave for mankind and will impact the next generation much more than this one.

Yes, GEB is awesome. But it doesn't have anything to do with this. You can check every input, it may just take a while.