Jim D asked:
The last Ice age end 18,000 years ago at which point global warming began. This is before human civilization. So man didn’t start global warming but is contributing to the situation. I find that the warming rate is still a point of discussion but the total is around 2 degrees F every ten years. What part of the 2 deg F is caused by human civilization?
Leon – You need to do some reading and get the facts. The ice started melting before man built a city.
Larry B – “Climate models referenced by the IPCC project that global surface temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100.” http://en.wikipedia.org/wiki/Global_warming
So we are talking about .2 – 1.1 deg F over 10 years from your source, but I have seen some at 2.5 deg F per 10 years.
Jeff P – What part of you speech is the answer to the question?
Hypofocus – I’m asking a question in order to make informed decisions. I’m not one of the sheep just getting in line!
Bob – Thanks for the graph, it paints a good picture.
The last Ice age end 18,000 years ago at which point global warming began. This is before human civilization. So man didn’t start global warming but is contributing to the situation. I find that the warming rate is still a point of discussion but the total is around 2 degrees F every ten years. What part of the 2 deg F is caused by human civilization?
Leon – You need to do some reading and get the facts. The ice started melting before man built a city.
Larry B – “Climate models referenced by the IPCC project that global surface temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100.” http://en.wikipedia.org/wiki/Global_warming
So we are talking about .2 – 1.1 deg F over 10 years from your source, but I have seen some at 2.5 deg F per 10 years.
Jeff P – What part of you speech is the answer to the question?
Hypofocus – I’m asking a question in order to make informed decisions. I’m not one of the sheep just getting in line!
Bob – Thanks for the graph, it paints a good picture.
Tags: 10 Years | Global Surface Temperatures
July 7th, 2008 at 8:19 pm
i think 33% global warming is done by human civilization
July 9th, 2008 at 10:59 am
The general agreement is that humans are responsible for approximately 70-90% of the current global warming. Yes the warming started long ago, but it has accelerated rapidly since the Industrial Revolution.
July 11th, 2008 at 4:10 am
All of the 2degree F is caused by humans . No other organism or species can be held responsible for this alarming situation, certainly not the plants , animals neither . it is us who disturbed this delicate balance of nature. carbon dioxide emissions are increasing due to the activities of humans and no other species
July 12th, 2008 at 9:33 pm
The temperature has only increased by 1.3 degrees F during the last century.
The cause is not totally understood yet.
July 14th, 2008 at 1:59 pm
The history of global warming is intimately linked to the levels of carbon dioxide in the atmosphere. 18,000 years ago, this was due to causes in nature and the ability existed to correct itself. Unfortunately, man-made CO2 emissions in the modern era are causing what could have been a natural cycle to cause temp increases at an alarming rate, more than the capacity of our planet to deal with. Something like 10 of the last 14 years are the warmest ever recorded in history, and virtually every legit scientist now agrees that it is not simply part of a normal cycle.
July 17th, 2008 at 6:06 pm
Solar scientists say that by 2020 the sun will be into its weakest solar cycle (aka. It won’t be so darn hot … and there is nothing man can do to stop it!)
July 21st, 2008 at 4:24 am
Ice ages and inter-glacial periods are caused by small changes in earth’s orbit called “orbital forcing”, also known as Milankovitch cycles. Since earth’s orbit can be computed for thousands of years into the past and future, orbital forcing can be computed very easily — and it turns out that orbital forcing peaked 6000 years ago, during the Holocene Maximum, and has been slowly COOLING the earth since then.
The best current determination of the causes of global warming are:
Natural causes (solar): +0.12 Watts per square meter [-.03,+.18]
All anthropogenic causes: +1.6 Watts per square meter [-1.0,+0.8]
Thus man is responsible for between 67% and 98% of global warming, with 93% being the most likely.
July 23rd, 2008 at 11:10 am
It doesn’t matter how much! Even if it’s just a little bit, it’s a little bit too much. Out contribution may be small, but it’s the straw that broke the camel’s back.
July 26th, 2008 at 3:09 am
Keith P has the numbers right, about 90%. Below is a nice picture about how things are changing over time.
Man’s contributions started to become significant about 100 years ago. Until about 30 years ago, natural forces were still pretty important. But recently, man’s ability to produce huge quantities of greenhouse gases has left nature far behind.
July 26th, 2008 at 10:37 pm
Just a comment about the 90% statistic: the IPCC findings suggest that they have concluded w/ 90% certainty that human activity is currently the primary source of global warming.
From my understanding, that is not to say that humans are 90% responsible for global warming.
I don’t know what % the IPCC attributes global warming to humans off hand, but the words “primary source” must either mean the greatest percentage relative to all other independent and isolated sources, or just the greatest percentage relative to all other sources combined.
Anyone want to watch the powerpoint from IPCC and check to see if they can assess a value?