Three German cities - Berlin, Hannover and Cologne - instituted a ban on cars that don't have catalizers or DPF (Diesel Particulate Filters). A windshield sticker proving a vehicle's environmental status is now needed to drive into the cities, known as environmental zones. But, like Mos Def wondering why he needs ID to get ID, how can you get a sticker if you're outside and want to come in? The website Green Zones will provide, for either 30 or 40 Euros. The website is available in 13 languages and the window badges will be valid in any of the German environmental zones.

Even if you're not planning on hitting those three cities any time soon, you might want to keep Green Zones in your bookmarks. More German cities will require the stickers come March, and Green Zones' stickers will work there as well. See the press release pasted after the jump for more details.

Related:

• New year, new bans: Berlin, Hannover and Cologne banning non-catalysed cars
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• Angela Merkel: The EU will lose legitimacy if CO₂ emissions are not reduced

[Source: Climate Company]