Post-Tribune: When it comes to climate change, the spinning — by talking heads, politicians, and vested interests on all sides of the issue — is enough to make anyone dizzy. It’s easy to get bogged down in the politics of the moment and miss the big picture, especially when it comes to the scientific research that forced the whole debate in the first place. The scientific bottom line is this: Climate change is happening now, and human activity is causing it. We’re already seeing the …