6/19/2023 0 Comments Gsp5 chapter 9 answersIt’s critically important to be aware of those natural climate change processes if we want to understand anthropogenic climate change. That continuous habitability is perhaps a little more surprising than you might think, as we’ll see below.Ī significant part of this chapter is about the natural processes of climate change and how they work. During Snowball Earth times, the global mean was as cold as −50☌, while at various times during the Paleozoic and Mesozoic and during the Paleocene-Eocene thermal maximum, it was close to +30☌.īut in spite of these dramatic climate changes, Earth has been habitable from very early in its history-as soon as liquid water was present-right through to the present day. ![]() Today’s mean global temperature is about 15☌. Not only has the climate changed frequently, the temperature fluctuations have been very significant. In the geological record, we can see this in the evidence of glaciations in the distant past, and we can also detect periods of extreme warmth by looking at the isotope composition of sea-floor sediments. ![]() If one thing has been constant about Earth’s climate over geological time, it is its constant change.
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