The Lord Mayor of Oxford advocates a 20 miles per hour (mph) speed limit for the city centre, following Jenny Jones, Member of the London Assembly.

The Government recognises that understanding of climate science and economics is continually developing, which is why it amended the [Climate Change] Bill to make it a legal requirement for the Committee on Climate Change to review the 2050 target and consider whether it needs to be tightened up to 80%. The Committee will have the independence and the right expertise to carry out this review, and will be able to provide a robust set of scientific and economic analysis to underpin its advice. Before taking any decision, we need to properly understand the implications, costs and benefits of different options. These are important issues with significant environmental, economic and social implications. For example what would be the economic costs and benefits of various 2050 targets? How would this be affected if the rest of the world was also taking meaningful action to tackle climate change, or if UK was going it alone?

This is why the Government has asked the Committee to review the 2050 target and advise, by December this year, on whether it should be tightened up to 80%. Once the Committee has reported, Ministers can then take a balanced view of the most appropriate level, particularly in the contect of progress at international level.

Reducing to 1990 levels by 2020 (25% reduction) and then 80% below that by 2050.

http://cleantechnica.com/2008/07/29/us-army-works-to-cut-its-carbon-bootprint-ba-da-bum/