We have had “global warming” since the Little Ice Age over 10,000 years ago, when much of the northern hemisphere was covered with ice. This, allegedly, was caused my a slow down of the Gulf Stream. When the earth warmed up, animals like the Wooly Mammoth became extent. Did cavemen cause this global warming?
In recorded history, the world has experiences “Mini Ice Ages”, or, I guess – “Global Cooling”, as the result of massive volcanic eruptions that spewed ash into the air, blocking the sun, and causing temperatures to drop.
Laki (Iceland), in 1783 caused record low winters in the eastern US.
Tambora (Indonesia) in 1815, caused an extremely cold spring and summer in the US and Europe, causing summer snowfall in the US and Europe. Crops were destroyed by the cold which led to famine across the Northern Hemisphere.
Krakatau (Indonesia), in 1883, caused unseasonably cold weather.
Mt. St. Helens (Washington) caused a .10º C drop in global temperature.
Pinatubo (Philippines) in 1991 causes a temperature decrease around the world.
In addition to the ash that was ejected, various toxic gases were also spewed into the upper atmosphere, effecting the ozone layers, causing a greenhouse effect, and causing acid rain.
The globe warmed up after each of these incidents.
It all boils down to –world weather patterns are going to change naturally. HOWEVER, man made krap that we dump into the air and on the earth can’t help. So I do what I can to not pollute.