Online search engines are a fantastic source of information. Quick efficient and increasingly reliable, a typical search returns results in less than a second, which doesn't leave much time to consider the environmental impact.

So what exactly happens when we hit the Google search button? For the average query, the servers used each work on it for just a few thousandths of a second. Together with other work performed prior to any search arts (such as building the search index) this amounts to a mere 0.0003 kWh of energy per search. It doesn't sound like much, but those clicks soon add up. It is estimated that energy used to power Google searches alone emits 96,5 tonnes of carbon dioxide every day.