While widespread use of green technology has a long way to go in India, there are some cities in the world that have already become role models in efficient use of resources.
Here is a look at world's top 10 green cities.
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World's 10 greenest cities
Copenhagen is widely considered one of the greenest capitals in the world. Chosen as the host of the Global Summit on Climate Change, the city served as a model for the 170 countries that attended.
By 2015, the city hopes to reduce CO2 emissions by 20 per cent and by 2025, it aims to be the world's first CO2 neutral capital.
Policies in place have already helped the city move closer to this goal. Copenhagen has invested heavily in clean-energy technology.
Once based on coal and oil, the city is now run almost entirely on natural gas. Denmark is also home to 5,600 windmills that supply around 10 per cent of the country's electricity.
The world's largest offshore windmill park is located in Copenhagen and powers 32,000 homes, which is around 3 per cent of the city's energy.
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World's 10 greenest cities
Starting in the 1960s, using a tiny budget and lots of creativity, the people in charge of running this Brazilian city began to turn it into a model of urban planning and sustainability.
The city planners wanted to alleviate the traffic congestion that contributed to long commutes and terrible air pollution, so they revamped their bus system that now serves 85 per cent of the people every day.
Under a programme, 70 per cent of the city's trash is recycled every week.
Today, because of the innovative planning that took place over 40 years ago, the residents of Curitiba take pride in their city and enjoy a standard of living that is one of the highest in all of Brazil.
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World's 10 greenest cities
For years, Freiburg has been known as "Green City" because of its long history as a rallying point for the environmental movement.
Over 30 years ago, a successful campaign against a proposed nuclear power plant nearby resulted in one of the first big victories of the green alternative movement in Germany.
Freiburg's preference for environment-friendly forms of transport with a focus on traffic avoidance and easily accessible city centers earned it the European Local Public Transport Award.
Today, the scenic German city, nestled amid gorgeous views of the Black Forest and Rhine River, continues to carry the torch of environmental stewardship.
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World's 10 greenest cities
Once a major manufacturing centre for Sweden, Malmo was forced to turn over a new leaf and reinvent itself when the country's industrial era ended.
With innovative ideas and a collective appreciation for the environment, Malmo is widely recognized as one of the greenest and most sustainable cities in the world.
Residents are famous for their love of cycling. Huge numbers of locals use their bikes to get to work or school.
The area known as Western Harbor is entirely powered by locally produced and renewable energy.
It also utilizes vacuum waste chutes so the area's streets are free of garbage trucks.
Many of the buildings have green roofs to both keep temperatures cooler in the summer and increase biodiversity.
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World's 10 greenest cities
After being named one of the world's most livable cities, the Melbourne City Council began to work on ways to further their standing.
They began a six-goal plan to achieve zero-net emissions by 2020. From strict green building codes and better city planning to larger educational programs, the city is well on its way.
With a low population density, it's important that the city's public transportation system is sustainable.
Just one example is Melbourne's airport shuttle, which is Australia's first carbon-neutral public transportation operator.
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World's 10 greenest cities
Portland has a number of interesting programmes that it runs through its Bureau of Environmental Services that keep the city clean and green.
The MAX light rail transportation system and the city's extensive bicycling lanes also provide Portland with effective green transportation options.
The Portland Brownfield Programme takes previously contaminated spaces and transforms them into vital and thriving lands for development.
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World's 10 greenest cities
The bustling port city of Yokohama is the second-largest in the country after Tokyo.
Yokohama brought both the first daily newspaper and gas-powered street lamps to Japan, and has a history of groundbreaking achievements.
With a location on Tokyo Bay, the modern city manages to use its aquatic location to its advantage with a number of innovative programmes centering on its water supply system.
The city is aiming to cut greenhouse gas emissions per citizen by at least 30 per cent by 2025 and 60 per cent by 2050.
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World's 10 greenest cities
This northern capital consistently tops the list of the greenest cities in the world and has recently been nominated for the 2011 European Green Capital Award.
With 24 per cent of the nation's energy coming from five major geothermal power plants and 75.4 per cent of the nation's electricity generated by hydropower and only .1 per cent from fossil fuels, Iceland is one of the most energy efficient countries in the world.
It is estimated that by 2050 Iceland will become a hydrogen-based economy.
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World's 10 greenest cities
With the heavily forested Stanley Park and its many popular beaches, Vancouver, British Columbia is a city that clearly values its relationship with nature.
The ambitious Canadians of Vancouver have set their eyes on becoming the greenest city in the world by 2020.
Current highlights in Vancouver include the greenest building code in North America, district renewable energy projects, and a brand-new Curbside Compost Programme.
In addition, the city continues to meet and exceed greenhouse gas reduction targets.
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World's 10 greenest cities
As a popular destination for people who enjoy skiing, hiking, and other mountain sports, Zermatt has a lot to offer. It is also a good example of what a well-known tourist area can and should do to protect its natural environment while ensuring future growth.
When this quaint Swiss town realized it would no longer be able to accommodate the growing traffic in the streets it decided, rather than expand to meet demand, it would limit traffic to certain areas and make most of its streets pedestrian-only.
Soon they realized that this was a very smart move, because pollution decreased and tourism increased.
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