I would like to present a speech on the global warming at this occasion.
Jonathan DuHamel July 21, Water vapor is a powerful greenhouse gas, but its net effect in the atmosphere is to lower temperatures party because of convective heat transfer. Carbon dioxide, a weak greenhouse gas, begins warming the planet. This warming evaporates water and so puts water vapor into the atmosphere which Festival carbon dioxide and global warming the warming effect.
This is called a positive feedback. At first look, this proposition seems logical and reasonable. But other properties of water vapor reduce temperatures and the net effect is a strong negative feedback.
A positive feedback tends to destabilize a system, whereas, a negative feedback tends to keep a system in check.
Just think for a minute, if water vapor had a net positive feedback effect, this planet would have had run-away global warming long ago. That alone should falsify the positive feedback hypothesis. The graphic below compares four pairs of cities, each at about the same latitude so that each pair receives about the same amount of sunlight, and the cities are inland, away from possible tempering by sea breezes.
The data is from the National Weather Service the temperatures have been corrected for elevation differences. The difference between the pairs is that one city is in an arid climate, the other is in a humid climate. We see that the more humid city in each pair has a lower average annual temperature.
The addition of water vapor to the atmosphere has a cooling effect in spite of water vapor being a greenhouse gas much more powerful than carbon dioxide. Another piece of observational evidence from Sweger shows humidity versus temperature measured daily at 3p.
Again we see a negative correlation of temperature with humidity, i. Compared to that, if carbon dioxide has an effect, it must be negligible. It is also clear from the data presented above that water vapor acts with a negative feedback. The data clearly shows that the relationship between the amount of water vapor in the air and temperature is negative; that is, the higher the amount of water vapor in the atmosphere the lower the surface temperature.
In that regard, it almost acts as a thermostat. This is the sawtooth graph showing the rise and fall of temperatures and carbon dioxide during the last few glacial-interglacial cycles. I ask, if rising carbon dioxide is further amplified by water vapor, why would the carbon dioxide and temperature rise terminate?
Could it be that other natural forces are much stronger than the effect of carbon dioxide? The temperature changes precede changes in carbon dioxide.
The surface radiates energy in infrared wave lengths back into the atmosphere. Some of that energy is absorbed by greenhouse gases, including carbon dioxide and water vapor, and some is re-radiated back toward the surface, thereby raising temperatures.
Why then, does the presence of water vapor, a strong greenhouse gas, cause cooling? The answer lies in the properties of water. First, it takes heat energy to turn liquid water into water vapor.
This is the latent heat of vaporization which absorbs heat energy without changing temperature. Likewise is the latent heat of fusion.
It takes heat energy to change ice to liquid water, again without changing temperature. Second, is the great heat capacity of water and water vapor, i.
Since hot air rises, the contained water vapor transports heat away from the surface by convection. The third property is related to the second. Water vapor is relatively transparent to incoming solar radiation in the visible part of the spectrum, but is an excellent absorber of infrared radiation.
This capacity warms the water vapor and heat is transported away by convection. And, of course, more water vapor in the atmosphere produces clouds which reflect incoming sunlight back into space, so it never reaches the surface to contribute to the greenhouse effect.
We see from direct observation that water vapor tends to moderate global temperatures. The climate system is amazingly complex, and the IPCC position that elements within the climate system especially clouds will change in ways which amplify the resulting small warming tendency is highly questionable, to say the least.K e r a l a Kerala (Kēraḷaṁ, Malayalam: കേരളം).
Kerala is one of the ten 'Paradises Found' by the National Geographic Traveler, for its diverse geography and overwhelming greenery. It is a land much acclaimed for the contemporary nature of its cultural ethos, and much appreciated for the soothing, rejuvenating paradise that it is.
Researchers at the University of Southampton, studying changes in ocean acidity recorded in the shells of fossilised plankton, found large amounts of carbon dioxide welled up from the deep.
It is estimated that the annual U. S. Carbon dioxide emissions from fireworks is 60, tensor the same emissions from 12, cars on the road for a year!! If one suggests that planting trees is a solution, then, please be informed that it’d take the entire lifetime of 5, tersest offset the 60, tons of carbon emissions produced in this.
Food’s carbon footprint, or foodprint, is the greenhouse gas emissions produced by growing, rearing, farming, processing, transporting, storing, . Climate change refers to man-made changes in our climate. It is often also called ‘global warming’, as one of the most well-known effects of climate change is a steady rise in the Earth’s temperature (1)..
Other effects include sea levels getting higher, ice melting at the poles, and extreme weather events like hurricanes and droughts becoming more .
"Do we have the capability to reverse global warming within a meaningful timeframe?" was the topic for discussion at the Sustainable Living Festival's Great Debate on 9 February The contributions to the discussion by David Spratt and Ian Dunlop are reproduced here.
Ian and David are also the authors of the recent reports .