Wow, what a load of c**p! I haven't seen that much do-do since the last time I went to cattle ranch! 
This is obviously written to try and scare people. If you were to take out the words "possibly", "may", "suggests", "if", "probably", "scientists don't know", etc. the article would only be about 1/2 as long. Was this article just filler, or a true investigative report?
It left a lot more questions than anything it answered.
First it says "Global warming, rather than causing gradual, centuries-spanning change, may be pushing ..."
Then it says "Though triggered by warming, such change would probably cause cooling ...
then it says "Worse, it would cause massive droughts, turning farmland to dust bowls and forests to ashes
Well, which is it? may, probably or would? Their argument starts with may and ends with would, and that is credible to someone?
Then it talks about forest fires? What the heck does that have to do with global warming/cooling? Does anyone really think that one or two-tenths of a degree determines the cause, size, and effect of forest fires? It is well known that the forest fires that have been occurring in the west (California) have occurred due to overgrowth of the forests here. The environmental wackos, (lobbiests) have prevented not only the logging industry from operating here, but they have prevented the forestry department from thinning the forests to prevent such fires! Forestry officials have been wanting to thin our forest for years now, but the environmental lobby just has too much power with the heavily liberal California legislature. They have testified that some areas have as many as 10 times as many trees as is healthy for the forest, but no clearing is being allowed. And this relates to global warming? And they say this will be a common thing if global warming occurs?--nonsense scare tactics.
Then it says "The data show that a number of dramatic shifts in average temperature took place in the past with shocking speed—in some cases, just a few years. "
While this is absolutely true, why have the Al Gores of the world ignored that fact when they claim a 1 degree raise in temps. over 100 years would be catastrophic? Why do they also ignore that these dramatic changes occurred before man could possibly have had any effect at all on the climate, because man wasn't around then?
Then it says " A warmer climate also increases rainfall and runoff into the current, further lowering its saltiness"
Don't these idiots realize that the increased rainfall comes from increased evaporation? Increased evaporation means raising saltiness that will offset the lowering saltiness from the rain!
Then it goes on "In 2001 an international panel of climate experts concluded that there is increasingly strong evidence that most of the global warming observed over the past 50 years is attributable to human activities—mainly the burning of fossil fuels such as oil and coal, which release heat-trapping carbon dioxide. "
What? In the past 200 years man "could" have contributed to global warming, actual temp. records have only been kept for about 150 years. Most of "gasses" that are blamed have been produced in the last 50 to 60 years, while about 75% of the warming during that period occurred before we produced these gasses and only 25% of the warming occurred since we started producing these gasses in large amounts. So let's see 75% of the warming occurred from 1855 to 1940 (a 85 year period of clean air) and 25% of the warming occurred from 1940 to today (a 65 year period of green house gasses). And now they are making a statement that most of the warming over the past 50 years is attributed to human activities? Are they saying this because the much greater warming that occurred before this, couldn't be attributed to us?--Wow, the more I read, the more amazed I become at the nonsense in that article.
I won't bother analyzing any more of it here, needless to say, the remainder of the article is just as full of holes as the part I have commented on.
Rodney