I found the following web-page which contains a dramatic degree-by-degree account of how climate change could play out in the future: http://globalwarming.berrens.nl/globalwarming.htm. It is more frightening than most other descriptions of the effects of global warming, and it contains no references to scientific literature or any evidence for the claims it makes.
Following is a summarised version of the claims that the text makes:
- At two degrees Celsius of warming, many major cities will be underwater, causing half of humanity to be displaced.
- If the world warms by two degrees, avoiding three degrees of climate change would be unlikely.
- At anything over two degrees of warming, millions or even billions could face starvation.
- Once three degrees of warming is reached, more warming is inevitable and societal collapse would ensue.
- There are also more, dramatic events that are claimed will occur.
To what extent (if at all) are the effects exaggerated? What is the degree of uncertainty about the scenarios for each degree of warming? Does the page represent the "consensus" scientific view?