Alex Wissner-Gross has popularized the notion that the energy required for two google searches can power a kettle to make a cup of tea (equates to roughly 15 grams of CO2 produced). Cumulatively then, the 200 million plus searches a day are likley to have some negative impact on global warming, if that theory is proven correct. Its likely that this information is precedent to some sort of internet taxation ado with the environment (i.e. not the investment in alternative sources of energy that have been stunted in growth due to oligopical market forces) but a tax to ensure that you have to work more to consume the same amount.