The London Daily Telegraph published a story by Robert Mathews that says leading climate researchers who have dissenting evidence on global warming are being rejected by Science and Nature, the same magazines for which the researchers do peer reviewing. One unpublished study found that in the top 1,000 articles on climate change, only ten had an author firmly state a connection to human activity.
I cancelled my subscription to Science in 1992 because it was so politically biased in the fields that I knew well that I couldn't stomach it anymore.