Some years back there was a hole in the Ozone layer above the poles,
scientists decided to remedy this and they have been very successful,
However when a ball spins it creates vortex's, could these holes above
the poles been natural exhausts/chimneys for the planet and by sealing
them, they the scientists stopped the accumulated rubbish air from being
withdrawn from the earth. Thus causing global warming. Go for it!!!! [}:)]
Just a small point that never actually comes up with a good direct answer.
What is the biggest contributor to global warming type gases on the planet?
We know the old live stock gets a smashing, but they don’t even come close in Methane.
So all you guru's what is it?
A small hint, there is zilch we can do about it
i'm not sure if i am just being semantic here but the biggest contributor is actually water, or water vapor.
increasing temperatures increases water vapor and there enters the scary concept of positive feedback.
water vapor, contributes 36–72%
carbon dioxide, contributes 9–26%
methane, contributes 4–9%
ozone, contributes 3–7%
positive feedback from what i understand is where the scientific debate is currently at and one point that the computer models are struggling with.
from what i understand there is no issue with the amount of co2 or methane or other gases that get released into the atmosphere as earth is a balanced system and the forests soak up the co2, then enters mankind and overloads the system beyond the natural cycle.
timeframes
from csiro "If significant mitigation efforts start in 2010, leading to emissions peaking in 2020 and CO2 equivalent concentrations stabilising around 600 ppm after 2060, scientists project a warming of 1.1 to 2.2 ºC by 2100. The chance of avoiding a warming of 2 ºC would be around 90 per cent.
However, if global emissions continue to climb so that CO2 equivalent concentrations exceed 970 ppm by 2100, then temperatures are projected to increase by 2.2 to 4.7 ºC by 2100, and there would be little chance of avoiding a 2 ºC warming.
The warming projected for Australia in 2070 is 1.0 to 2.5 ºC for a low emission scenario (similar to a 500 ppm CO2 equivalent path) and 2.2 to 5.0 ºC for a high emission scenario (similar to the world’s current path).
Warming is projected to be lower near the coast and in Tasmania and higher in central and north-western Australia. These changes will be felt through an increase in the number of hot days. In Canberra, for example, the present annual average of five days over 35 ºC may rise to seven to 10 days by 2030 and eight to 26 days by 2070.
"
taken from wiki.....
Examples of the atmospheric lifetime and GWP for several greenhouse gases include:[51]
Carbon dioxide has a variable atmospheric lifetime, and cannot be specified precisely.[52] Recent work indicates that recovery from a large input of atmospheric CO2 from burning fossil fuels will result in an effective lifetime of tens of thousands of years.[53][54] Carbon dioxide is defined to have a GWP of 1 over all time periods.
Methane has an atmospheric lifetime of 12 ± 3 years and a GWP of 72 over 20 years, 25 over 100 years and 7.6 over 500 years. The decrease in GWP at longer times is because methane is degraded to water and CO2 through chemical reactions in the atmosphere.
Nitrous oxide has an atmospheric lifetime of 114 years and a GWP of 289 over 20 years, 298 over 100 years and 153 over 500 years.
CFC-12 has an atmospheric lifetime of 100 years and a GWP of 11000 over 20 years, 10900 over 100 years and 5200 over 500 years.
HCFC-22 has an atmospheric lifetime of 12 years and a GWP of 5160 over 20 years, 1810 over 100 years and 549 over 500 years.
Tetrafluoromethane has an atmospheric lifetime of 50,000 years and a GWP of 5210 over 20 years, 7390 over 100 years and 11200 over 500 years.
Hexafluoroethane has an atmospheric lifetime of 10,000 years and a GWP of 8630 over 20 years, 12200 over 100 years and 18200 over 500 years.
Sulphur hexafluoride has an atmospheric lifetime of 3,200 years and a GWP of 16300 over 20 years, 22800 over 100 years and 32600 over 500 years.
Nitrogen trifluoride has an atmospheric lifetime of 740 years and a GWP of 12300 over 20 years, 17200 over 100 years and 20700 over 500 years.
hi mineral, i re-read your post and see that i was being semantic or just miss understanding.
thought you said what is the biggest contributor to global warming, not biggest contributor of ghg to global warming.
another big fat fail cisco,
export coal you say. what a crock try this from 2009
www.abc.net.au/news/2009-09-11/australians-the-worlds-worst-polluters/1425986
and here is the original 2009 report
www.maplecroft.com/about/news/australia_overtakes_usa_as_top_polluter_09.html