Although the Bluejays won 9 of their final 13 games, this fact doesn't mean that they had any shot at being in the playoffs. Why? Because if you look at their season record, they won only 46.3% of their games, whereas the Yankees won 63.6% of their games (and went on to win the World Series). In other words, the long-term trend of the Bluejays in the 2009 season was of not being in the playoffs, let alone the World Series. Why does all this matter? Well, it's not because I'm a Bluejays fan, but because it's a good analogue of climate trends:
Even through annual temperatures may appear to have been stable or dropping in recent years, looking only at that short-term trend tells one as much about the direction of climate change (either of increasing temperature or decreasing temperature) as looking at the 69.2% winning trend of the Bluejays right before the end of the regular season: bupkis.
The winning trends of teams over 162 games of the 2009 regular MLB season is what determined which teams would go to the play-offs and eventually to the World Series. Therefore, if we look at a representative segment of the Blue Jays' and the Yankees' seasons, you will note that the Blue Jays had a strong downward (i.e., losing) trend over the last season (R^2=0.8236), while the Yankees had a strong upward (i.e., winning) trend over the last season (R^2=0.7743).
Note: For comparison purposes, I have presented the data of all games from 5/6/2009 (one month after the start of the 2009 regular season) to 10/4/2009 (the last game of the 2009 regular season). The percent-wins were calculated based on how many games each team had won since 4/6/2009 (the start of the 2009 regular season). However, the percent-win values for the first month were not included in the trendline calculation due to the strong effects that the starting percent-win values would have on the trendline (i.e., no team can start with a percent-win value of anything other than 0% or 100%, thus skewing the trendline calculation.) On 5/6/2009, the Blue Jays were playing their 30th game, and the Yankees were playing their 27th game.
Therefore when a person who stayed in on February 4, 2009 in Ann Arbor, MI said, "See? It's -9 degrees outside! Global warming can't be happening!" That person is as incorrect about drawing a conclusion as the person who went to see the Bluejays beat the Red Sox on September 30 and says, "Did you see that win? We're going to go all the way this year!"
(Okay, I'm rehashing the analogy that Keith Olbermann read on one of his shows in early October - a story from ThinkProgress.org - but it was a good analogy, so I am repeating it here... but with no mention of the horrible Op-Ed by George Will, and no mention of the complete blindness with which he answered the assertion laid out above. However, you can go read the ThinkProgress story and have a chuckle if you'd like.)