Not sure what Al Gore's version of global warming is but if it is that human beings are causing it I'm inclined to agree. We have swarmed over the surface of this globe and caused almost illimiitable damage to the natural balance of nature.
It didn't just start with modern man. The Romans turned the Northern fringes of Africa into a desert over 2,000 years ago. The Spaniards did the same thing by chopping down most of their forests to make their great armada to invade England. All over the world huge swathes of forest have gone. And, as you know, in your own country Oaklahoma became a dust bowl because of the overplanting of wheat. There were vasts forest right across America. Where are they now? A few pockets preserved against the loggers who would but even those down.
But the real destruction began when our world population started to esculate in the second part the 20th and this century. When I was born in 1936 the world's enitire population was estimated at 2 billion. India had 300 million. It's now got well over a billion. China - well! In 75 years its more than tripled to close on 7 billion.
Forests and grass lands are the world's lungs. We've been treating those lungs like a chain smoker. W're hooked on 'progress' and won't take any heed of Nature's warings. We know there has been huge melting of the ice caps. We know the average temperature of the sea is rising round the world. Even if it is partly a longterm 'Cycle of Nature' we are still, in my opinion contributing to it.