What real evidence is there that humans are causing global warming? Freon is heavier than air, so it sinks and never reaches the ozone. CO2 is produced by every living thing on the planet, yes, even cows burping seems to cause %26quot;greenhouse gases%26quot;.
Anyone have any real evidence, and if so, why do some scientists insist that it%26#039;s not real while others say it%26#039;s totally real?
http://www.sciencemag.org/cgi/content/ab...
So the current warming has nothing to do with ice ages, or with coming out of the last ice age. It must be something else. There are two possibilities: it could be the Sun. Or it could be the rapid increase in greenhouse gases caused by human burning of fossil fuels. As it turns out, it%26#039;s easy to tell the difference between the two, and the scientific case for increased greenhouse effect is rock solid.
2. If the Sun is causing the current warmth, then we%26#039;re getting more energy, and the whole atmosphere should be getting warmer. If it%26#039;s greenhouse, then we%26#039;re getting the same amount of energy, but it%26#039;s being distributed differently: more heat is trapped at the surface, and less heat is escaping to the stratosphere. So if it%26#039;s the Sun, the stratosphere should be warming, but if it%26#039;s greenhouse, the stratosphere should be cooling.
In fact, the stratosphere has been on a long-term cooling trend ever since we%26#039;ve been keeping radiosonde balloon records in the 1950%26#039;s. Here%26#039;s the data:
http://hadobs.metoffice.com/hadat/images...
http://hadobs.metoffice.com/hadat/hadat2...
http://cdiac.ornl.gov/trends/temp/sterin...
3. If it%26#039;s the Sun, we%26#039;re getting more energy during the day, and daytime temperatures should be rising fastest. But if it%26#039;s greenhouse, we%26#039;re losing less heat at night, and nighttime temperatures should be rising fastest. So if it%26#039;s the sun, the difference between day and night temperatures should be increasing, but if it%26#039;s greenhouse, the day-night difference should be decreasing.
In fact, the daily temperature range has been decreasing throughout the 20th century. Here%26#039;s the science:
http://ams.allenpress.com/perlserv/?requ...
http://ams.allenpress.com/perlserv/?requ...
http://www.bom.gov.au/bmrc/clfor/cfstaff...
4. Total solar irradiance has been measured by satellite since 1978, and during that time it has shown the normal 11-year cycle, but no long-term trend. Here%26#039;s the data:
http://www.ngdc.noaa.gov/stp/SOLAR/solar...
5. Scientists have looked closely at the solar hypothesis and have strongly refuted it. Here%26#039;s the peer-reviewed science:
http://www.pubs.royalsoc.ac.uk/media/pro...
http://www.mpa-garching.mpg.de/mpa/publi...
6. CO2 levels in the air were stable for 10,000 years prior to the industrial revolution, at about 280 parts per million by volume (ppmv). Since 1800, CO2 levels have risen 38%, to 385 ppmv, with no end in sight. Here%26#039;s the modern data...
http://www.esrl.noaa.gov/gmd/ccgg/trends...
... and the ice core data ...
http://www.ncdc.noaa.gov/paleo/icecore/a...
http://www.ncdc.noaa.gov/paleo/icecore/a...
http://www.ncdc.noaa.gov/paleo/icecore/a...
... and a graph showing how it fits together:
http://farm4.static.flickr.com/3006/2615...
7. We know that the excess CO2 in the air is caused by burning of fossil fuels, for two reasons. First, because the sharp rise in atmospheric CO2 started exactly when humans began burning coal in large quantities (see the graph linked above); and second, because when we do isotopic analysis of the CO2 we find increasing amounts of %26quot;old%26quot; carbon combined with %26quot;young%26quot; oxygen. Here are the peer-reviewed papers:
http://adsabs.harvard.edu/abs/1984JGR......
http://www.ingentaconnect.com/content/mk...
http://www.sciencemag.org/cgi/content/ab...
The %26quot;some scientists%26quot; who say global warming is non-human are overwhelmingly NOT climatologists. Among climatologists, well over 95% (and probably closer to 98%) accept that global warming has a significant human component. And over 30 international scientific organizations support human-caused global warming, compared to zero -- yes, zero -- scientific organizations that deny it. In science, that%26#039;s about as good a consensus as you%26#039;re ever going to get.
http://www.sciencemag.org/cgi/content/fu...
The rapid depletion of fossil fuels and the rising sea level from the warming of the earth%26#039;s atmosphere are converging to dramatically alter our future. Edward Mazria, founder of Architecture 2030, unveils a new study of sea level rise showing fly-over 3D images depicting potentially calamitous coastal and national impacts. Series: Frontiers of Knowledge
Its a lie, Al Gore creates more global warming spewing his hot air about it than the rest of us going about our daily lives combined.
But we know what did, Keith P goes over what happened the way a skeptic would (an actual skeptic, not a claimed skeptic that just denies the fact of global warming).
If you didn%26#039;t understand that the basic reason is that we know when all the natural cycles occur and it just so happens that we aren%26#039;t in a warming cycle (and there hasn%26#039;t been any correlation with solar activity for a while either)
%26quot;What real evidence is there that humans are causing global warming? Freon is heavier than air, so it sinks and never reaches the ozone.%26quot;
Aside from there only be a tangential relation between the hole in the ozone layer and global warming the CFCs do very much reach the stratosphere since the stratosphere is within the heterosphere where the atmospheric gases are well mixed by atmospheric turbulence (and it%26#039;s enough to get things far heavier than CFCs up to the turbopause).
But think what you%26#039;re saying, CFCs are heavier then air, so is carbon dioxide so you%26#039;d expect CO2 to sink and form a layer of CO2 on the surface upon which is the layer of molecular oxygen and then the layer of nitrogen and then the layer of atomic oxygen.
That%26#039;s just not how the atmosphere is below 100 km.