As the 2012 Summer Olympics get underway this weekend, the world's attention will be focused on London.
But a team of scientists has recently been keeping a very close eye on the city that hosted the games four years ago: Beijing.
They've discovered that China's efforts to cut back on traffic and clean up its air during the 2008 Olympics could have big implications for curbing climate change.
A recent study published in the journal of Geophysical Research Letters shows that Beijing's traffic restrictions during the games led to a significant reduction in emissions of a powerful greenhouse gas: carbon dioxide (CO2).
