You do realize that 1977 cover is a fake? You even linked the image from the article on scienceblogs.com saying it was a fake.
scienceblogs/com

Now why would someone fake something like this? Propaganda anyone? That image was created and promoted specifically to fill your head with lies.

The science is clear that the world is warming, and humans are the cause. We can argue about what the effects will be and what to do about it, but claiming it is not happening is just sticking your head in the sand. This military takes this seriously, so should the rest of us.
National Security Implications of Climate Change for U.S. Naval Forces