Albedoirradianceinsolationand Anthropogenic cloud It is thought that global dimming is probably due to the increased presence of aerosol particles in the atmosphere caused by human action. The pollutants can also become nuclei for cloud droplets. Water droplets in clouds coalesce around the particles.
Natural climate variability over recent geological time is greater than reasonable estimates of potential human-induced greenhouse gas changes. Because no tool is available to test the supposition of human-induced climate change and the range of natural variability is so great, there is no discernible human influence on global climate at this time.
Perhaps, but there may be other, more scientific reasons. As Peter Sciaky, a retired geologist, writes: A geologist has a much longer perspective.
There are several salient points about our earth that the greenhouse theorists overlook or are not aware of.
The first of these is that the planet has never been this cool. There is abundant fossil evidence to support this — from plants of the monocot order such as palm trees in the rocks of Cretaceous Age in Greenland and warm water fossils in sedimentary rocks of the far north.
The present global warming is hardly unique. No environmental conference, such as Kyoto, has ever invited a geologist, a paleontologist, a paleo-climatologist. It would seem beneficial for any scientific investigatory to include such scientific disciplines.
Among all my liberal and leftist friends and I am certainly one of thoseI know not a one who does not accept that global warming is an event caused by mankind. I do not know one geologist who believes that global warming is not taking place.
I do not know a single geologist who believes that it is a man-made phenomenon. The chart to the right shows temperature and carbon dioxide levels from to now. That presents quite a different picture.
Only years ago, the planet was quite cold, a period known as the Little Ice Age roughly Before that, though, during the Medieval Warm Period roughlythe planet was a degree or two Celsius warmer than today, to the point where Greenland was warm enough for settlement by the Vikings.
Figure 1 is a graph of the last thousand years based on work by climatologist H. IPCC hockey stick graph of the past 1, years Over the past 4, years, the planet has also experienced warm and cool periods, again quite naturally.
In fact, warm times seem to recur on a cycle of about 1, years, as Figure 3 shows. Warming every 1, years or so. What do we see? A roller-coaster ride of glacials cold times and interglacials warm timeson a cycle of aboutyears.A team of researchers from the U.K., Sweden and Australia has found that three periods of global warming slowdown since were likely due to natural causes rather than disruptions to the.
Global Warming Causes Global warming is primarily a problem of too much carbon dioxide (CO2) in the atmosphere—which acts as a blanket, trapping heat and warming . You’re probably asking yourself, how do humans cause global warming?The three most significant ways in which you likely contribute are: Driving your car which requires the combustion of tremendous amounts of fossil fuels.
These fuels have been storing carbon for thousands, possibly millions of years. An earthquake occurs because of the movements of tectonic plates beneath the surface of the earth.
These movements create waves which propagate through the earth. Causes of Global Warming: the Human impact Greenhouse gases have risen sharply since , primarily due to the Industrial Revolution.
Since the dawn of the Industrial Revolution, humans have increasingly been contributing unnatural sources of greenhouse gases into the system, causing the system to become unbalanced. Most climate scientists agree the main cause of the current global warming trend is human expansion of the "greenhouse effect" 1 — warming that results when the atmosphere traps heat radiating from Earth toward space.
Certain gases in the atmosphere block heat from escaping.