From bike lanes to wood chips, mayors from cities worldwide compare notes at climate talks

It isn't easy getting Italy's city dwellers out of their Fiats, off their Vespa scooters and onto bicycles to ride to work, "like here in Copenhagen," says an Italian environmental official.

"It isn't a matter of painting a right lane and saying, 'This is a bike lane,'" explained Emanuele Burgin, a Bologna provincial councilor. "We realize we're far away from this."

But Copenhagen's lord mayor has her problems, too. Finding enough parking space for all those bikes is just the beginning.

"First, we must get rid of our coal plants, and we need to get that subway expansion built," Ritt Bjerregaard told The Associated Press. She also wants even more Copenhageners cycling than the one-third who pedal each day to the office or school.

Bjerregaard and some 80 other mayors and local officials, including New York's Michael Bloomberg and representatives of Tokyo, Jakarta, Toronto and Hong Kong, have converged on the Danish capital in their own climate and energy summit. They'll compare notes on how cities can combat climate change and save money on energy and other costs.

This five-day "cities summit," opening Monday, will parallel the second week of the U.N. climate conference, intended to boost international efforts to reduce emissions of carbon dioxide and other gases blamed for global warming. President Barack Obama and more than 100 other national leaders will attend that U.N. conference in its final days.

Today's cities and towns consume two-thirds of the world's total primary energy and produce more than 70 percent of its energy-related carbon dioxide emissions, the International Energy Agency reports. That will grow to 76 percent by 2030, the agency says. Most comes from electrifying and heating private, commercial and municipal buildings.

In a report last week, the IEA's executive director, Nabuo Tanaka, said local authorities "have significant potential to reduce greenhouse gas emissions" through renewable energy and other means. "Yet relatively few are taking up the challenge," he said.

Cities face many obstacles to becoming more "climate-friendly" — from extensive old infrastructure that would be cost too much replace, to political interests that resist City Hall's plans. The New York example is illustrative.

New York City last week approved legislation requiring owners of larger buildings to conduct energy audits and replace insulation and take other steps toward energy efficiency. But under pressure from developers and real-estate interests, the measures were stripped of requirements for more costly improvements, such as total overhauls of heating systems and replacing windows.

Similarly, Bloomberg's efforts to cut traffic in Manhattan by charging fees to drive cars in certain neighborhoods was blocked by New York State politicians.

London succeeded where New York failed. In 2003, then-Mayor Ken Livingstone introduced a daily "congestion charge" — the equivalent of $16 — on cars and trucks entering the central city during business hours.

Other big cities are also trying to lead on climate. Sao Paulo, Brazil, for example, a sprawl of 11 million people, has by law set as a goal a 30 percent reduction in emissions by 2013. It has already achieved 20 percent since 2005, chiefly through its new system of generating biogas for energy at landfills, instead of allowing waste methane, a greenhouse gas, to rise into the skies.

Here in this city of 1.2 million, Bjerregaard also has set ambitious goals.

Copenhagen reduced its CO2 emissions by 20 percent from 1995 to 2005. The lord mayor plans to reduce it by another 20 percent by 2015, and then to become "carbon-neutral," free of fossil fuel for core needs, by 2025.

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