I think people are expecting to see noticable temperature rises on an annual basis in order to quantify global warming and prove to themselves that it's real. Here's the deal, most reputable scientists know global warming is happening. Many non-scientists, especially politicians, say it is not happening. Since the topic is environmental science, only enviornmental scientists should get a vote in this. Just remember that we have only been in the Holocene Period with 4 seasons for 10,000 years. Historically, the world spends much more time in Ice Ages than outside of them. This is a very delicate system and when we hit the tipping point, Mother Nature is going to unleash Hell.