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Originally Posted by DougF
I have a question, just how much precipitation can you get? and if you make it rain here, are you depriving someplace inland of rain?  |
Hard to know isn't it? But world air humidity has been rising and it is a greenhouse gas.
Cities seem to have their own microclimates because of all the concrete and lack of greenery.
This was interesting:-
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Scientists at the University of Manchester have conducted a study looking at the effect global warming will have on our major cities, and say a modest increase in the number of urban parks and street trees could offset decades of predicted temperature rises. The study has calculated that a mere 10% increase in the amount of green space in cities would reduce average urban surface temperatures by as much as 4°C.
This 4°C drop in temperature, which is equivalent to the average predicted rise through global warming by the 2080s, is caused by the cooling effect of water as it evaporates into the air from leaves and vegetation through a process called transpiration.
Green spaces collect and retain water much better than concrete, and as the water evaporates from the leaves of plants and trees the surrounding air is cooled. This process, called transpiration, is similar to the human cooling effect of perspiration.
“Urban areas can be up to 12°C warmer than more rural surroundings due to the heat given off by buildings, roads and traffic, as well as reduced evaporative cooling, in what is commonly referred to as an ‘urban heat island’,” said Dr Roland Ennos, who worked on the project with Professor John Handley and Dr Susannah Gill in the School of Environment and Development.
“We discovered that a modest increase of 10% green space reduced surface temperatures in the urban environment by 4°C, which would overcome temperature rises caused by global warming over the next 75 years, effectively ‘climate proofing’ our cities.
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Cloud seeding was pioneered by the CSIRO in Australia 50 or more years ago. But if you haven't got any clouds, what can you do?
http://www.greengeek.ca/2007/10/14/s...perature-rise/
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So what's wrong with a plant?
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SOME AIR PURIFIERS CAN MAKE AIR QUALITY WORSE
According to the study, which appears in the Journal of the Air & Waste Management Association, using an ozonolysis air purifier in a sealed room can lead to ozone levels as high as 350 parts per billion, a level equivalent to a Los Angeles Stage 2 Smog Alert.
The EPA has already come out against ozone-producing air purifiers, saying that they have “little potential to remove indoor air contaminants.”
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http://www.greengeek.ca/2006/05/11/s...quality-worse/
