Overall, temperature increases are projected to increase by the year 2100 within a range of 1.1 to 6.4˚C. In order to focus on this set of outcomes, the IPCC has come up with a best estimate at the lower end of this range of 1.8˚C, and 4˚C at the upper end. Even at the lower estimate, the consequences of climate change could be severe in several parts of the world, including an increase in water stress, serious effects on ecosystems and food security, and threats to life and property as a result of coastal flooding.
到2100年，全球气温预计会上升1.1到6.4˚C。为了集中解决这一系列的后果，IPCC提出的最佳估计是最低可能上升1.8˚C，最高可能上升4˚C。即使按照最低估计，在全球的几个地区，气候变化的后果也可能非常严重，包括用水短缺加剧、生态系统和食物保障受到严重破坏、沿海洪灾威胁生命财产。