re: World climate changes
The changes described by mogul264 are changes that occured by natural forces over geologic time, meaning very slowly, usually over tens- or hundreds-of-thousands or even millions of years. What we are seeing today are changes that are accelerated by the past century of pumping ever-increasing amounts of greenhouse gases into the atmosphere from fossil fuel combustion that we use to generate electric power, run our factories/all sorts of industries, power ships, trucks, buses, cars, and heat buildings and homes. The rate of greenhouse gas release into the atmosphere is unparalleled in history - can you imagine how large an amount as billions of tons per a year is? No one who is educated can deny that doing this does not come with eventual consequences that threaten our existence on this planet, i.e. what we have been doing "business as usual" is unsustainable on so many levels.
