In general terms, the IPCC is the international body of climatologists who have the titanic-sized job of figuring out where global warming is going to take the human race. Their update today sort of ratcheted down the short term alarm bells that they have been ringing for several years- but on the other hand, it left the long term projection for terrible consequences looking more solid than ever.
If you noticed, one of the sub-headlines for the Guardian article is "how hot will it get in my lifetime." With all due respect, Guardian newspaper, that is not the actual question that the human race needs to address. We all either have children, or if we do not, we care about the human future. On that basis, the question is not how hot will it get in my lifetime (for example, I am 57, and it will not get that hot before I am tossed into grave) but is rather, how hot will it get until it STOPS GETTING HOTTER. The answer to that question, according to the IPCC, is pretty damn hot. We are likely to see 2 degrees C increase in the 21st century, plus more in the 22nd. Sea levels will creep up 26 to 82 centimeters by 2100- the low number is bad, the high number is amazingly horrible. In case you wondered, there are 2.5 centimeters in an inch. After 2100? More creeping up, possibly at a faster rate if our carbon dioxide burden in our sky continues to rise from the burning of coal, natural gas, and oil. Do you own a home in Florida? Do I have to tell you what flood insurance now costs to anyone in Florida who is within a mile of the coast? (Which in Florida, is a bunch of people, no kidding). You may not believe in global warming. But insurance companies do believe in it, because they live in the real world and they have to shell out big money when hurricanes and other extreme weather events happen.
Actually, if you want to get yourself educated, here is the whole enchilada:
By the way, climate "skeptics" (see, I can be civil) if you have been crowing about the slowed rate of atmospheric warming over the recent few years, you might want to pay attention to the part of the report that patiently explains that the excess heat has gone into the oceans instead of the atmosphere. You might want to pay attention, but of course you are not going to. :) There is a law of physics called "the conservation of energy" which states that energy does not go away, it just changes. Carbon dioxide traps heat, and the heat may hide for a time, but it never changes into cold. It is what it is, what do you want me to say?