Slide 3: We live in an unusual, stable climate
The earth's atmospheric composition and temperature change over the long term. This graph details variations over the last 500 000 years. It is clear from the graph that the current period (approximately the last 10 000 years) has been unusually climatically stable. However, it is clear that there has been considerable variation over the last 500 000 years, following a pulsed trend typical of a system varying around an equilibrium value. It is important to note that the Holocene (recent history) is particularly warm in relation to the planet's history - Earth is generally better adapted to a cool climate.