"I reluctantly read this article, but by the end had the attitude of "why not". I would be interested in your points of view / comments about this topic."

I think impactors have influenced global climate, but I doubt that Tunguska was sufficently powerful to have much affect. I mean why pick all the nuclear weapon testing as a factor- far more than fifteen one-megaton atomic bombs- I believe if I'm recalling correctly that the Soviets tested one bomb which had 50 megaton. Not to mention a large number of atmospheric nuclear tests. Ahh, here is something:
"It is estimated that the total yield of all the atmospheric nuclear weapons tests conducted is 438 megatons. That's equivalent to 29,200 Hiroshima size bombs. In the 36 years between 1945 and 1980 when atmospheric testing was being conducted this would have been equivalent to exploding a Hiroshima size bomb in the atmosphere every 11 hours."
[[Well, at least that's what Greenpeace says:) ]] :
http://archive.greenpeace.org/comms/nukes/ctbt/read9.html

But in terms raw power and an actual measurable affect on global climate:
"The 1883 eruption of Krakatoa is among the most violent volcanic events in modern times (a VEI of 6, equivalent to 200 megatons of TNT - about thirteen thousand times the yield of the Little Boy bomb which devastated Hiroshima, Japan (which was officially recorded as only 15 kilotons). In contrast, the biggest bomb ever exploded by man, the Tsar Bomba, had an explosive power of 57 megatons.) Concussive air waves from the explosions travelled seven times around the world, and the sky was darkened for days afterwards. Waves from the tsunamis were recorded as far away as the English Channel."
And:
"Long-term effects

The eruption produced erratic weather and spectacular sunsets throughout the world for many months afterwards, as a result of sunlight reflected from suspended dust particles ejected by the volcano high into Earth's atmosphere. This worldwide volcanic dust veil acted as a solar radiation filter, reducing the amount of sunlight reaching the surface of the earth. In the year following the eruption, global temperatures were lowered by as much as 1.2 degrees Celsius on average. Weather patterns continued to be chaotic for years, and temperatures did not return to normal until 1888. British artist William Ashcroft made thousands of color sketches of the red sunsets half-way around the world from Krakatoa in the years after the eruption. In 2004, researchers proposed the idea that the blood-red sky shown in Edvard Munch's famous 1893 painting The Scream is also an accurate depiction of the sky over Norway after the eruption."
http://en.wikipedia.org/wiki/Krakatoa

In other words it's thought that Krakatoa has caused a greater affect on Global temperature than all the temperature increased by all Global warming that can rationally attributable to "human effects" [ which is somewhere around .5 C over last hundred years]. In other words Krakatoa could have been more than twice the effect as any human effects.