Proof it’s possible: Sweden has beaten Kyoto targets and reduced its emissions by 12.7 percent.
Air quality is [downright horrible][1] today so moderate your cycling speed and don’t get into that car if you’re a driver.
[1]: http://deus.irceline.be/~celinair/pm/pm10.php?lan=en (Particulate matter (PM10 and PM2.5) concentrations in ambient air [site language: English])
The interface at Paris:Invisible City takes a bit of getting used to but it's worth exploring.