Spreading awareness about the dangers of SUVs.

Governor Deval Patrick said today he is looking at a Hummer tax — adding higher registration fees for gas-guzzling cars and offering discounts for those that do less harm to the environment. One industry opponent said it would be the first such fee in the nation on the state level.

The suggestion comes as Patrick prepares to unveil a fuller version of his much-awaited transportation plan on Friday. While he would not release details today, Patrick said at a Greater Boston Chamber of Commerce appearance that any gas tax increase would be coupled with a freeze on toll rates.

Environmentalists applauded the registration proposal, saying it would encourage people to buy smaller and more fuel-efficient cars, which are increasingly seen as key to curbing global warming. Similar proposals have been proposed in Massachusetts since at least 2001, but without the prominent backing of a sitting governor.

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London already charges a tax, known as a congestion charge, on almost all vehicles that enter central and parts of west London. Certain vehicles, such as those hybrids or eco-friendly fuel cars are exempt. Livingstone’s most recent announcement, however, vastly increases the charge for the highest polluting vehicles.

Vehicles in band G, those that emit more than 225 grams of CO2 per kilometre, will pay a whopping £25($50) every day to enter the congestion zone. This will mostly affect heavy 4×4 vehicles. Most other vehicles will continue to pay the daily charge of £8($16).

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