Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment
Do you study geology as well?
The only major events that will have any true effect are volcanic eruptions of the magnitude of krakatoa, which caused global cooling of about 5 degrees.
The problem is such events are rare and very dangerous to the people near by.
Why can't this be left blank?
Not really. You are looking only at events that directly related to temperature, but considering a lot of other – smaller events – is also very important.
Wild fires are very important to forests (those that prone to have them), but very inconvenient to us.
1. They produce nitrogen oxide that is required for seed germination
2. They remove the leaves of older trees to give light to seedlings
3. Ashes provide nutrients
Ultimate outcome of squashing wild fire is less photosynthesis since younger plants do a lot more when they need to grow than the old ones.
Grass lawns may look pretty, but again less photosynthesis than common weeds (but we would not like those!).
Lately, someone came up with the way to alter hurricanes, but those are also important to regions that have them! Seed dispersal; removing old, frail, and rotting trees; and most of the time brining much needed rain! Of course, when hurricane does occur, cleaning up after it is also a bad idea from that stand point (and we really would not like that mess!).
These are just a few examples related photosynthesis (and, therefore, to carbon dioxide levels) where each event on its own does not have a drastic effect, but rather cumulative effect over years (like effect of pollution).
I watched a BBC film entitled the Big Chill. I wrote a review.
“The Big Chill”,
presented by BBC, and Science & Nature TV radio, discusses the potential impacts of global warming on Earth.. The film begins with a hypothetical situation in which a future Britain could be like the French Riviera.
The film quickly segues into interviews with geologist disputing this scenario. In an interview with researcher, Dr. Bill Turrell, he paints quite a different scenario. Turrell, a man who has been studying the ocean current for many years, has noticed a drastic change in the salinity content within the currents of the Gulf Stream waters. The implications posed by Turrell and other scientist, present catastrophe for planet Earth. The film compares the workings of the Gulf Stream to that of a conveyor belt. A continuous cycle of warm water flow fed by the gulf into the northern Atlantic is fueled by the higher salinity content off of Britain’s shore. The salinity contributes to a sinking effect of the warmer Gulf flow. A notable increase in global temperatures has precipitated an increased melting of the ice caps of Greenland. The melting of the ice in turn has begun to dilute the salty brine of the Atlantic. The causative effects of the diluted waters could pose a cessation of the Gulf Stream, and this would in turn create a freeze condition for the European continent.
I have developed my own opinions based on the film. The Gulf Stream conveyor belt seems somewhat analogous to the homeostatic temperature control mechanism of the human body. As with the body, when an increase in body temperature is detected the body responds with a sweating reflex to provide cooling for the body, the Gulf Stream warm water currents are reduced by the melting caps, and in response, the salinity reduces, and the climate temperatures lower, which in turn starts a freeze on the ice caps. As the ice sheets freeze, less fresh water is introduced into the Atlantic, thus salinity once again raises, the Gulf Stream conveyor belt resumes, and temperatures return to normal. The question then becomes: How long are these cycles.
To Draco's comment: I have taken a course in Earth Science, which is an interdisciplinary course that deals with geology, animal evolution, cell biology, chem it is just a very broad course that deals with a lot of stuff - not my favorite.
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