According to the Times of London, a newspaper which has no problem chopping down trees to distribute spread garbage like this story, each Google query you make pumps 7g of CO2 into the air.
Techcrunch gives us some realistic comparisons, and a suggestion that will both save the environment, and make you healthy -- eat less cheeseburgers. Saying that Google is pumping an unreasonable amount of CO2 into the air is simply rediculous -- considering Google does everything it can to make themselves as energy efficient as possible. This includes covering their headquarters in solar panels, and building data centers that take advantage of hydroelectricity.
Are you concerned about the environmental impact of doing Google queries?