Are Humans Responsible For Climate Change?
Climate scientists are 95% confident — that is to say, surer than ever — that humans are responsible for at least “half of the observed increase in global average surface temperatures since the 1950s.”
This is the major headline from the report, as it marks a stark spike in confidence over the last 12 years, as scientists were 90% confident in 2007 and 66% confident in 2001 of the same conclusion.
An increase in carbon dioxide concentrations that is “unprecedented” in the last 20,000 years, along with increases in other emissions, have driven up average temperatures by about 0.6 degrees Celsius (1 degree Fahrenheit) since 1950, the report states.
Worst-case predictions are that by 2100, temperatures could increase by as much as 3.7 degrees Celsius (6.6 Fahrenheit), the report says.