I'm writing an essay on the effect of global warming on polar bears.I'm having trouble coming up with my 3 points for the paragraphs anyhelp?

Although polar bears are white, you have brought up two very grey-area topics.

First, there's the whole question of "global warming." The phrase "global warming" is mentioned so often that it's taken by many to be an absolute fact: that the whole globe of this planet is warming up. And the implication is that unless we humans do something about it, it will continue to do so. I mean, none other than Al Gore says if we don't cut down our burning of fossil fuels and thereby stop putting all that carbon dioxide into the atmosphere, terrible things will happen. And one of those terrible things may be the extinction of the polar bears. Well, is this the truth? Is it? It all depends on who you ask and where you look. Is the warming just part of a natural cycle that is hundreds of thousands of years old? Is it tied somehow to sunspot cycles or some other natural causation? Or is it just a recent phenomenon? Hmmm? No one knows for sure. What is pretty sure is this: the early predictions of a steady rise in the earth's overall temperature have already been found to have been exaggerated. OK, so much for grey area number one.

Now to the plight of the polar bears. How may of them are there? What is their total population? Who does the counting? How reliable are the numbers? Well, it turns out that there are now somewhere between 20 to 25,000 polar bears, but nobody knows for sure. Are their numbers declining? Are they increasing? Nobody knows for sure. So much for grey area number two.

So here we sit (and you sit at your computer ready to write something intelligent): we have the first speculation that humans are making the earth heat up and then the other speculation that this is endangering the polar bears. But: there is no hard, reliable scientific data to support either view.

My suggestion to you is not to allow yourself to get trapped by a question that pretends to be self evident. It isn't. The white polar-bear controversy is afloat in a cold, grey sea where the ice may be increasing, or decreasing, or just doing its mysterious, natural and maybe cyclical old thing.