The evidence for recent Global Warming is abundant and is generally accepted almost everywhere in the world outside the USA. How much of the recent Global Warming is caused by human action is slightly less certain, but most people (and in particular most scientists) accept that the major contribution is from overuse of carbon fuels.
Here are some contrary opinions.
What you are asking is, if man has any part in the current global warming and climate change. The answer is unequivocally YES. The warmest year on record occurred in 2010. At present global warming, NASA reports 40% of polar caps have disappeared. This is causing torrential rains, snowstorm, droughts, forest fires, soil erosion, sea level rise. Permafrost is thawing, releasing methane, a greenhouse gas 20 times more potent than CO2. Any measures mankind has to stop CO2 emissions to reverse this catastrophe may be too late.
Imagine this: The sun's rays enter the earth's atmosphere, warm us up, and bounce back out leaving a little residual heat so we don't begin another ice age. Our atmosphere is primarily nitrogen, oxygen, and a little bit of carbon dioxide. When all our cars and planes buzz around they emit greenhouse gases (from burning fossil fuels). The greenhouse gases trap heat. The sun's rays come in, heat us up, but can't bounce back out as easily as before because the greenhouse gas molecules envelope the earth like a heavy blanket and the heat can't radiate as well. This results in a build up of excess heat. There's global warming for you.
Global warming has been measured. It is difficult to argue with a thermometer, though some folks insist the thermometer record is distorted by the "urban island" heat effect. Cities, with all their concrete, asphalt, higher concentrations of CO2, automobiles, etc. tend to be warmer than the surrounding countryside. Satellite measurements and records omitting urban areas both show a general rapid increase in temperature.
So the warming is both real and obvious. The next question would be, is the warming largely the result of human activity? Humans pump 30 billion tons of CO2 into the atmosphere each year. This is about 100 times what all earth's volcanoes combined emit (per the USGS).
Numerous scientific organizations around the world, tasked with understanding climate change, have created models which clearly implicate human activity as the primary cause for current climate change. These include the Geophysical Fluid Dynamics Laboratory model run by NOAA (the US National Oceanic and Atmospheric Administration), the UK's Hadley Centre Coupled Model, and the Educational Global Climate Model developed by the Goddard Institute for Space Studies as a joint project between Columbia University and NASA.
well if global warming is a hoax then i guess global cooling is too.
both global warming and cooling are just natural cycles of the Earth which people have turned into something more than they actually are.
i have never heard of it but i know global warming is real so if there's global warming there isn't global cooling because they are 2 different things
The recent and sustained global warming period is now known to have been caused by the positive Pacific Decadal Oscillation (PDO), where the Pacific waters warm up for around 25-30 years. We are now in a negative PDO, so there is expected to be a sustained cooling trend for the next 25 years or so.
Simultaeneously, the sunspots have decreased and may cease around 2015 leading the earth into what is called a solar "minimum" similar to the Maunder or Dalton minimum. If this happens, then another cooling trend may become active. Historically, this has accounted for a 0.5 degree F drop per year in the earth's temperature for each year of delayed sunspot activitly. We will have to wait and see how much it really drops (Cycle 24 was delayed aboput three years).
A drop in sunspots is associated with an increase in solar gamma rays hitting the upper atmosphere and an increase in cloud formation, yet another cooling trend. It is uncertain at this time whether this can even be measured.
We are also now in the proper planetary orbital orientation which favors a cooling if not an actual return of an ice age.
Please understand that the global warming effects of CO2 in the prescence of such large amounts of water vapor, diminishes to a small fraction of a degree, once pass
100 ppm.
So, the next several years will tell which trends, warming or cooling, will prevail.
Global warming is certainly real. The year 2010 had the warmest global average temperature on record, fractionally warmer than 2005 and 1998, but as the difference is slight, the three years are regarded as the equal hottest. The past decade was the warmest since instrumental measurement began in 1850, and the ten warmest years since 1850 have now all occurred since 1998.
It is also known that the temperature rise that the world has experienced is consistent with the rise in atmospheric carbon dioxide levels, from the normal range of 260-280 parts per million (ppm) to 380 ppm. Scientists say that because carbon dioxide is a greenhouse gas, it is this increase that has caused average global temperatures to rise. So the question is whether this increase in atmospheric carbon dioxide and the resultant temperature rise are caused by human activity, and are therefore anthropogenic.
Scientists have been able to use isotope comparisons for C12, C13 and C14 ratios, to prove that the increase from 260-280 ppm to the present 380 ppm of atmospheric carbon dioxide is entirely due to human activities. This joins the dots and tells us that anthropogenic global warming is real.
Yes, global warming is real. NASA and NOAA both have research programs that demonstrate the earth is warming faster than for which any natural phenomenon can account.
Climate models by these and other agencies effectively demonstrate the reason for the current rapid rise in earth's temperature is due primarily to the increase of carbon dioxide gas, from the chemical oxidation/reduction of fossil fuel (coal and oil). Human beings currently release more than 30 billion tons of this gas into the atmosphere each year.
Many global scientists who are cognizant with the facts believe it is real, many others do not.
Answer:
In a poll taken by Doran and Kendall Zimmerman in 2009, of scientists in different fields, 97% of those who published at least half of their peer-reviewed research in the climate field agreed that human activity was significant in changing global temperature.
Anderegg et al. similarly found in 2010 polling that 97% of actively publishing climate scientists went along with the international panels' consensus on global warming.
So there is no doubt that an overwhelming consensus of those scientists cognizant with the facts believe that global warming is real and is caused primarily by human activity.
As to the extent of global warming, the year 2010 had the warmest global average temperature on record, fractionally warmer than 2005 and 1998, but as the difference is slight, the three years are regarded as the equal hottest. The past decade was the warmest since instrumental measurement began in 1850, and the ten warmest years since 1850 have now all occurred since 1998.
It would be global cooling.
In global warming, the glaciers would melt, then they would flow into the ocean, then they could affect ocean currents, changing the climate, in some areas. And with global cooling, there would be more glaciers, depleting the ocean waters.
Nothing. It would be part of the natural cooling of the planet.
Steady surface temperature increases were noted between the 1970s and 1990s.
Global warming is happening and the earth is not cooling. It is warming. 2010 and 2005 tied as being the two hottest years on record, and the ten hottest years since 1800 have all been in the past fifteen years.
It would be global cooling.
Turning off the sun may cause global cooling
The opposite would be global cooling.
It cools it somewhat. Global cooling occurs after a volcanic eruption when clouds of dust remain in the sky for several days reflecting the sun's rays. This results in a cooling of the atmosphere.
No, definitely not.
yes
Global warming is when the global average annual temperature is generally trending upward. Global cooling is when it is trending downward.A:Global warming is happening now. Global warming is not beyond the control of mankind. It is being caused by our dependence on fossil fuels (coal, oil and natural gas) which we are burning to produce electricity.
If global cooling means the gradual cooling into an Ice Age, then that has happened in the past and it has taken thousands of years to happen. The present global warming has all happened far faster, in less than 200 years, and is threatening all life on the planet if we can't stop it. Global warming is by far the more dangerous situation.
There was a time in the 1970s when scientists though the earth might be approaching a global cooling period. This was quickly proved incorrect. But a possible result of global cooling would be more ice caps, larger glaciers, colder winters, cooler summers etc.
Global cooling ended at the end of the 19th century. According to warmists, this is because of the rise of industry which began to emit pollution (carbon dioxide).
If Global Warming and Global Cooling can be balanced correctly then the Earth should be a better place
No, that would probably be evidence for global cooling.