January 7, ] volution is the cornerstone of modern biology. It unites all the fields of biology under one theoretical umbrella. It is not a difficult concept, but very few people -- the majority of biologists included -- have a satisfactory grasp of it.
Draft - 1. Introduction This essay presents some observations on how the Earth's climate has changed during the era of satellite observations beginning in when it became possible to see the planet as a whole world has changed through that time. The observations of how our planet has changed are real.
What they are telling us about our future is open for interpretation. The majority of climate scientists think they paint a picture of a rapidly warming at least in any geological or ecological sense world, where the rate of warming over the last few years has been accelerating. Our world's climate is a chaotic and highly complex system.
As such it is impossible to make exact predictions how climate will change over the next few years or decades. However, we can consider how climate may continue to change in terms of risk.
This is discussed in the concluding Section 7. How should we react to the observed global warming?
The observations show a growing risk to human society from runaway global warming, and they beg explanation. Arguably climate variation in the Arctic Region, and especially the area of the Arctic Ocean drives global climates through its effects on the location and behavior of the Northern Hemisphere's jet streams see A Rough Guide to the Jet Stream: For an explanation of how this can be see Wikipedia's Thermohaline Circulation and Shutdown of Thermohaline Circulationand also Section 5.
It is also the case that the Arctic as a whole appears to be warming at something like twice the rate of the rest of the planet. This essay focuses on observations of what appears to be the start of runaway warming in the Arctic that may have profound effects on global climates over the next few years; and a plausible cause - the warming driven release of methane gas from permafrost forming a strong greenhouse cap over the Arctic Ocean.
Evidence shows that over the last few years winter cooling over the Arctic Ocean has been significantly retarded when the sun is below the horizon for months at a time when heat absorbed over summers with 24 hour daylight should be radiating away to outer space.
A mass extinction is an event in which at least % of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large. Even though it is a dark subject,it is always uplifting to see the good hearts commenting here. This is a very powerful article Dane,thank you a million times over for the battle you chose to wage.
The observations summarized here are based on computerized analyses of many millions of data points collected per day covering the entirety of the satellite era, beginning in To encapsulate summaries with the minimum of text and numeric data, I have used a number of animated maps where primary data is encoded in color.
Changes in this data over time intervals ranging from days to months and years are shown as a stack of gif images forming short movies. To me, in addition to a continuing rise in arctic temperatures, the most conspicuous indication that we may have passed a tipping point where arctic warming is increasing at an ever faster rate as shown by the graph below.
This depicts changes in the areas extents covered by sea ice on the whole planet. Over the half year on each day of the year the area of the globe covered by sea ice has been by far the lowest it has ever been in the satellite era for those days and from 7 January until around March - a period of two whole months - there has been less sea ice on the planet since the previous record low recorded in mid February The Permian period lasted from to million years ago* and was the last period of the Paleozoic Era.
The distinction between the Paleozoic and the Mesozoic is made at the end of the Permian in recognition of the largest mass extinction recorded in the history of life on Earth. It affected many. The Cambrian explosion or Cambrian radiation was an event approximately in the Cambrian period when most major animal phyla appeared in the fossil record.
It lasted for about 20 –25 million years.
It resulted in the divergence of most modern metazoan phyla. The event was accompanied by major diversification of other organisms. Before the Cambrian explosion, most organisms were simple.
about ,, years ago early seaweed formed.. Molecular clock methods indicate that red and green algae arose around 1,,, years ago, and the secondary symbiosis that eventually led to the chromists occurred around 1,,, years ago during the late Mesoproterzoic era, after the earth's transition to a more highly oxygenated atmosphere with an ozone screen.
The Arctic is defrosting as warm Atlantic waters rush through the Fram Strait instead of skirting the southern coast of Greenland. This is an important event, regardless of the deafening silence exhibited by the mainstream media. Image courtesy of the National Snow and Ice Data Center, https://nsidc.
Psychology and Geology - Psychology is the study of the mind and the behavior of mammals. Geology is a science that deals with the history of the earth and its life, recorded in rocks. acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large.