阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。
Mayor Boris Johnson Monday outlined plans to make London “the cleanest，greenest city on Earth” by the 2012 Olympics and called for commitments from other world cities at a climate change conference.Leaders of the world's 40 largest cities are meeting in Seoul this week for a summit on combating global warming — the third to be held since 2005.
“What we should do in Seoul is agree that we will stop the endless addiction of mankind to the internal combustion engine (内燃机)，”said Johnson.He said at a press conference the world's cities consume 75 percent of the world's energy and produce 80 percent of the emissions which cause climate change.“The problem of our planet is an urban problem，” Johnson said.
He said the British capital wants to use the Olympics “to drive
the greening and the improvement of our city” and noted that London is
committed to reduce carbon dioxide emissions by 60 percent by 2025.
Johnson said the key measure was being taken to solve problems
relating to housing and commercial buildings，which accounted for 70 percent of carbon dioxide emissions in
London.This involved retrofitting (翻新)—installing lagging—in large numbers of public buildings.
Johnson proclaimed himself a“passionate cyclist”and said he would
push ahead with cycle superhighways around London.
London's air quality problem，he said，was caused by vehicle emissions from 8,300 worn and used diesel (柴油) buses，which could be replaced by low-carbon vehicles.In addition，there were also 32,000 taxis running on diesel fuel，which could be replaced by electric vehicles.
Johnson said there would be a few programs
in the next few years to produce a “cleaner，greener” bus for the city.“The age of the diesel bus has got to be
over in London.”
