DC: Earlier this month, The New York Times featured an article titled “Hockey in the Desert.” The article concluded that by building a hockey stadium in Las Vegas, the National Hockey League was contributing to climate change. The phrase “contributing to” is used over and over by political leaders and the media to voice concern about human-caused global warming, but “contributing to climate change” is a meaningless phrase.
In his address at Georgetown University in June of 2013, President Barack Obama stated, “…the planet is warming, and human activity is contributing to it.” In 2011, New Jersey Governor Chris Christie said, “…climate change is occurring and that humans play a contributing role…” In Congressional confirmation hearings, Energy Secretary Rick Perry affirmed that man-made activity was contributing to climate change.
Every human activity contributes to climate change. If you have a housecat, it “contributes to” climate change. As we burn sugars in our body, we produce carbon dioxide (CO2). Every time you exhale, you breathe out 100 times the concentration of CO2 in the atmosphere. The real question is “What is the size of human contribution compared to natural factors?” more here