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Sweden scores top marks as an ecological-friendly performer particularly in the areas of environmental health, forestry and water management. Last year it was ranked the most sustainable country in the world by sustainability because of its use of renewable energy sources, low carbon dioxide emissions and green government policies. According to the International Energy Agency, 44% of the country’s energy comes from renewable sources. The Swedish government is composed of numerous ministries which are each tasked with enforcing clean energy sources, carrying out green-friendly public transportation in their rail networks and ensuring high quality healthcare services. The country also charges a carbon tax to discourage oil use. Last year, the Swedish government set an ambitious goal of phasing out fossil fuels by 2020 and having zero net greenhouse gas emissions by 2050.

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The problem being avoided is that half of the people living in in san francisco bike and walk to their destinations. Over 17 percent of san francisco is surrounded by parks and green space. All of this accounts to how much pollution is spread which is a small portion.

Population growth, increasing water demand, loss of habitat and water pollution are all sustainable challenges that san francisco need to be changed but it is not easy too due to such a growth that will continue to grow.

In 2001, San Francisco people voted  a $100 million budget to purchase solar panels, energy efficiency, and wind turbines for public facility +
- Shika

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Half of Portland’s power come renewable sources, it is america’s top green city. It has 92, 000 acres of green. In 2008 Portland recycled 56.8% of waste generated. Gateway Green is a plan made in 2009 and includes support from the Governor of Oregon. Green Gateway is one of Portland's new parks, it is an unused 25 acre field.

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Copenhagen want to make their city completely carbon neutral by 2025. They want to, “replace coal with biomass, to add more wind and solar electricity to the grid, to upgrade energy-guzzling buildings, and to lure even more residents onto bikes and public transit.”

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During his 3 year period as mayor, Enrique Peñalosa created a really efficient bus system and redid many sidewalks for pedestrian safety. He also built over 180 miles worth of bike trails and revived 1,200 green spaces. Enrique also restricted car use on streets in the city during rush hour, and raised the gas tax. This cut rush hour traffic by 40%. They also have a “car-free day” and want to eliminate personal car use during rush hour by 2015.

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In the 1990’s Ecuador went through some massive disasters in the country. Bahía de Caráquez governmental and nongovernmental organizations are trying to make the city more sustainable. They want an ecological city, in 1999 trying to develop programs to protect biodiversity, re vegetate denuded areas, and control erosion.
- Sheikh

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Switzerland topped the 2014 EPI(Environmental Performance Index) list for its ecological and green policies, even though it is “resource constrained” by virtue of its fenced-in geographical location. But thanks to some innovative environmental management practices, Switzerland has become one of the most sustainable nations in the world in the areas of climate change, biodiversity and habitat protection. Over the past five years, the Swiss introduced 15 regional parks with two additional national parks underway, scoring higher than any other country for protected terrestrial areas. It also houses the densest rail network in Europe and provides free recycling services while charging for routine garbage collection which is rare in most countries. Thirty-one percent of the country is covered in forests, which provides a lucrative timber industry creating hundreds of thousands of jobs, most Swiss homes are constructed of wood. More than half of its domestic electricity production comes from hydro-power plants and another 40% from nuclear power. In 2013, it reset its goal to reduce carbon dioxide emissions to at least 20% below 1990 levels by 2020, Huffington Post reported.
-max

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Vancouver aims to be the world's greenest city by 2020. To do this they are approaching transport, energy buildings, technology, etc. in a green way. This year they released a public bike share program called Mobi.

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There is a revolutionized plan called the Morar Carioca Program, it aims to change the favelas, it has a combination of better landscapes, education tools and more. They plan to have it completed by 2020.