Australasian Science: "There are human and natural factors acting in the climate system, and understanding all the factors influencing our climate is an ongoing scientific goal. But the current increase in CO2 and its effects on our planet are attributed to human activity because they have a pattern, in space and in time, which is what we expect from increased greenhouse gases, and which cannot be explained by other forces, such as changes in solar output or volcanic ash. This IPCC report strengthens the building evidence...