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Initiatives by topic
The municipal policy is to reduce CO2 emissions by 20% before the end of 2015.
Copenhagen aims to be carbon-neutral by 2025. Commercial and residential buildings are to reduce electricity consumption by 20 percent and 10 percent respectively, and total heat consumption is to fall by 20 percent by 2025. Renewable energy features such as solar panels are becoming increasingly common in the newest buildings in Copenhagen. District heating will be carbon-neutral by 2025. New buildings must now be constructed according to Low Energy Class ratings and in 2020 near net-zero energy buildings. By 2025, 75% of trips should be made on foot, by bike, or by using public transit. The city plans that 20-30% of cars will run on electricity or biofuel by 2025. 
Copenhagen and the surrounding areas have three beaches with a total of approx. 8 kilometres (5 miles) of sandy shores within 30 minutes cycling from the city centre. These include Amager Strandpark, which opened in 2005 with a 2 km (1 mi) long artificial island and a total of 4.6 km (2.9 mi) of beaches, located just 15 minutes by bicycle or a few minutes by metro from the city centre.
The beaches are supplemented by a system of Harbour Baths along the Copenhagen waterfront. The first and most popular of these is located at Islands Brygge and has won international acclaim for its design. 
In 2001 a large offshore wind farm was built just off the coast of Copenhagen at Middelgrunden. It produces about 4% of the city's energy. 
Cycling in Copenhagen is - as with most cycling in Denmark - an important means of transportation and a dominating feature of the cityscape, often noticed by visitors. The city offers a variety of favourable cycling conditions — dense urban proximities, short distances and flat terrain — along with an extensive and well-designed system of cycle tracks. This has earned it a reputation as one of the most—possibly the most—bicycle-friendly city in the world. 36% of all citizens commute to work, school or university by bicycle; in fact, more people commute by bicycle in greater Copenhagen than cycle to work in the entire United States. Cycling is generally perceived as a healthier, environmentally friendly, cheaper and often quicker way around town than by public transport or car and it is therefore municipal policy for the number of commuters by bike to go up to 50% by 2015. 
Years of substantial investment in sewage treatment have improved water quality in the harbour to an extent that the inner harbour can be used for swimming with facilities at a number of locations. 
Copenhagen Street Food, food market in the heart of Copenhagen
Copenhagen is a green city well endowed with open spaces. It has an extensive and well-distributed system of parks that act as venues for a wide array of events and urban life. As a supplement to the regular parks, there are a number of congenial public gardens and some cemeteries doubling as parks. It is official municipal policy in Copenhagen that all citizens by 2015 must be able to reach a park or beach on foot in less than 15 minutes. 
Towards sustainable economies
As a result of its commitment to high environmental standards, Copenhagen has been praised for its green economy, becoming the world's leading green city in the 2012 Global Green Economy Index. 
The city's architectural planning authorities have given special attention to both climate issues and efforts to ensure maximum application of low-energy standards. Priorities include recycling rainwater, green roofs and efficient waste management solutions. In city planning, streets and squares are to be designed to encourage cycling and walking rather than driving.
News and comment
How do you build a healthy city? Copenhagen reveals its secrets, Feb 11 
The Transition Flower Shop, Mar 21 
Two-wheel takeover: bikes outnumber cars for the first time in Copenhagen, Nov 30 
Denmark now has a second grocery store selling expired food, Nov 28 
Massive Passenger Increase After Bikes Allowed Free on Trains, Nov 14 
Meteoric Rise in Bicycle Traffic in Copenhagen, Nov 4 
Copenhagen's getting healthier, thanks to everyone in the city, Sep 16 
Scandinavia’s First Zero Packaging Supermarket Opens This Summer, Mar 9 
Is this the world's best bike-share bike? October 10 
Copenhagen's piles of bicycles, October 14 
Copenhagen’s Cycle Snake completed, September 10 
Copenhagen’s Christmas tree lights to be powered by bikes,  December 2