He said a failure to agree on this matter would "represent a backward step for Northern Ireland".
"We are moving in the right direction and do not need to be taking a backward step, " she said.
Mr Birkett said this was a backward step, especially as the low emission zone was the mayor's own policy.
BBC: Boris Johnson announces plans for Ultra Low Emission Zone
Philip Ruddock, the immigration minister, has taken a backward step by introducing a kind of second-class citizenship for some refugees.
Ms de Vere Taylor said while she accepted language had to evolve, in her opinion the council's decision was a backward step.
The frenetic, slightly scrappy opening continued and Scotland went six points clear when Ireland prop John Hayes was penalised for taking a backward step to wheel a scrum.
"If I have to take the odd backward step on the way to landing the title in August, then that is what I will have to deal with, " he said.
Liberal Democrat leader at the council Jeremy Hilton said there were other alternatives, while Labour's Steve Lydon said it was a "backward step" as the county tries to increase recycling rates.
So some might be forgiven for thinking they were taking a backward step bringing their hour-long show, entitled Chase the Dream, Not The Competition, to Edinburgh's Udderbelly, which holds just 410 people.
However, Breandan MacConnaith from the Garvaghy Road Residents Coalition, which opposes the route the Orangemen want to use for their annual Drumcree parade, said the review of the commission was a backward step.
Messi had been relatively subdued after his early brilliance, but he broke the shackles to burst clear and force another excellent save from Almunia as the Spanish giants refused to take a backward step.
Tim Bresnan has taken a backward step in this series although I think he is probably a better bowler than we saw at Lord's, but he did not bowl with the pace that Shahzad did and looked ordinary when the ball was not swinging.
Moreover, as I think you know, plan B represents -- or would represent a major step backward in these discussions and a major step backward for the American people.
Sadly, the United States, where innovation-intensive industries account for one third of GDP, looks set to keep taking one step backward for every step forward in that drive.
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So every step backward for CAPTCHA is a step forward for AI.
FORBES: Artificial Intelligence Will Defeat CAPTCHA -- How Will We Prove We're Human Then?
Calling it a huge step backward is needless hyperbole and more inflamatory than informative.
Then, recently, she took a big step backward, rescinding the treasured right to work from home.
FORBES: Yahoo Spins No-Work-From-Home Policy As Morale Booster. Seriously.
But, she said, she doesn't believe Chicago's proposed school is a step backward.
The result of this oversight is a gigantic step backward for women with little or no income of their own.
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In both cases, Seidenberg took a step backward to the number two position, before eventually moving up to CEO again.
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Dumb watches don't need to be charged or wound, so smart replacements start by taking a step backward in that regard.
ENGADGET: Editorial: iWatch app speculation is filler, not killer
And it came with a stylus, that relic of the Palm Pilot era, making the Note feel like a step backward.
As she waited for him to speak, she took another step backward, and whatever was not right in her stomach got worse.
An entrepreneur who has nurtured his startup like a beloved child may be reluctant to take a step backward and make the changes that need to be made.
Even financial ratings agencies, which we have come to trust with our money, have taken a huge step backward due to their role in the recent mortgage crisis.
If the issue of vendor lock-in is not carefully managed, the cloud could represent a step backward in terms of its impact on flexibility and choice in the enterprise.
FORBES: RedHat CEO Whitehurst: Don't Be Tricked into Cloud-based Lock-in
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