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Our climate is changing
Global average temperatures have increased by around 0.7°C during the last 100 years. In the last few years there has been a noticeable cumulation of record-warmth years, which can hardly be ascribed to coincidence.
- Annual global median temperature 1850-2005, showing trends over the last 25, 50, 100 and 150 years (IPCC, 2007).
Global temperature predictions for three different emissions scenarios (A2, A1B, B1) and the hypothetical case of a stabilisation of greenhouse gas concentrations at year 2000 levels (IPCC, 2007).
- Annual global median temperature 1850-2005, showing trends over the last 25, 50, 100 and 150 years (IPCC, 2007).
Global temperature predictions for three different emissions scenarios (A2, A1B, B1) and the hypothetical case of a stabilisation of greenhouse gas concentrations at year 2000 levels (IPCC, 2007).
There are strong regional variations in the observed temperature changes, with the land areas of the northern hemisphere having warmed up disproportionately. In Switzerland an extraordinarily strong rise in temperature of 1.4°C (twice as much as the global median) has been observed.
Warming of 0.6°C over the last 50 years can no longer be explained by natural factors alone. Most of the observed increase in temperatures is very likely due to the increase in greenhouse gas concentrations caused by humans.
The prognosis for the 21st century is further, and accelerated global warming. The IPCC has developed a range of scenarios involving variations in future population development, economy and technology. Depending on the scenario, a warming of 1.1 – 2.9°C (low scenario) or 2.4 – 6.4°C (high scenario) is expected. Within this, there are significant regional and seasonal differences. In Europe, the predicted strongest seasonal warming is in Southern Europe during summer, and in Northern Europe during winter.
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