If you reread the article from the beginning, you will see that it is intellectually dishonest. Here is the thesis:
"Global warming doesn't matter except to the extent that it will affect life -- ours and that of all living things on Earth. And contrary to the latest news, the evidence that global warming will have serious effects on life is thin. Most evidence suggests the contrary."
As you go through each of his paragraphs, do you really feel like he has taken the best conceptual arguments for the seriousness of the consequences of global warming and shown that the evidence for these scenarios is thin? He hasn't. Rather, his thesis is supported with straw men about the particulars of mockingbirds and vikings.
"Global warming doesn't matter except to the extent that it will affect life -- ours and that of all living things on Earth. And contrary to the latest news, the evidence that global warming will have serious effects on life is thin. Most evidence suggests the contrary."
As you go through each of his paragraphs, do you really feel like he has taken the best conceptual arguments for the seriousness of the consequences of global warming and shown that the evidence for these scenarios is thin? He hasn't. Rather, his thesis is supported with straw men about the particulars of mockingbirds and vikings.