While congestion charging schemes to control CO2 emissions from traffic are proving controversial in London and elsewhere, there's a chance we might see some action in Brussels on this problem very soon.

While our own drive to drastically improve car efficiency changes gears, there are of course plenty of other people trying to get the message across. One such group, Mundo Cars, isn't the new line of Slovakian automobiles it might appear to be, but a collaborative effort by several organisations working on transport issues.

Protests by lorry drivers in London and Wales today show the strength of feeling surrounding fuel prices and, as oil hit US$135 a barrel last week, they're unlikely to fall anytime soon. Hauliers want the government to abandon proposed 2p tax increase and so ease the pain, but that would only be a short-term fix for a long-term problem - what's really needed is affirmative action on setting minimum fuel efficiency standards for road transport.

Which is why, if you happened to be in Brussels yesterday morning, you would have seen a bizarre site - six cavemen and women travelling the streets in Flintstones-esque car. (Don't believe me? Watch the video.) They were exposing the stone age thinking (geddit?) of the car industry who, lead by German car manufacturers, have been stifling attempts to improve car efficiency and reduce CO2 exhaust emissions for 17 years. First stop was the headquarters of the car manufacturer's lobby group, the European Automobile Manufacturers' Association (ACEA), to deliver copies of a new report about the impact their industry is having on climate change.

London mayor Ken Livingstone was never going to get an easy ride over his planned changes to the congestion charge, and Porsche's threat of a legal challenge is perhaps no big surprise. Famed for its fast, sleek, inefficient cars, it claims the new £25-a-day charge on gas guzzlers is "unfair and disproportionate".

As well as the promised judicial review, the company has started a petition for the Jeremy Clarksons of this world to voice their opposition to Ken's plan. "We know that huge numbers of people in London and across the rest of the country support our case," they claim. "They agree with us that it would be bad for London - that it is unfair and sends the wrong message about what sort of a city London is whilst having no meaningful benefit on the environment."

As reported in yesterday's news, London's congestion charge is being modified again to improve the capital's green credentials. From October, vehicles emitting the highest amounts of CO2 will have to pay £25 a day which gets a big thumbs-up, while the most efficient cars will get into central London free of charge.

Some commentators have pointed out that this effectively changes the purpose of the charge from reducing congestion to reducing pollution, and that's no bad thing. According to the World Resources Institute, road transport spews out around 10 per cent of global emissions (pdf), so providing incentives to move to more efficient models is going to do a lot to cut those exhaust fumes.

As one fossil fuel giant sidelines its alternative energy projects and invests in even more damaging technologies such as tar sands, the former head of another multinational has made some startling demands vis a vis car efficiency. To all intents and purposes, Sir Mark Moody-Stuart- ex-chairmen of Shell - wants to see all gas guzzlers banned.

Expanding on a column he wrote for the BBC website, Sir Mark said that the EU should bring in a minimum standard of 35 miles per gallon (mpg). "Nobody needs a car that does 10-15mpg," he said. "We need very tough regulation saying that you can't drive or build something less than a certain standard. You would be allowed to drive an Aston Martin - but only if it did 50-60mpg."

The UK is baking in the summer heat - and in London, the Motor Show has started. So ask yourself, what does your car say about you?

(Warning: the video contains some mildly rude words...)

Early this morning 35 Greenpeace volunteers shut down the assembly line making gas-guzzling Range Rovers. Urban 4x4s made at this site are wrecking the climate.

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