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  2. Here are most and least environmentally friendly states - AOL

    www.aol.com/most-least-environmentally-friendly...

    Story at a glance Personal finance site WalletHub released a study ranking the 50 states on three factors — environmental quality, eco-friendly behaviors and climate change contributions.

  3. Sustainable energy - Wikipedia

    en.wikipedia.org/wiki/Sustainable_energy

    The environmental dimension of sustainability includes greenhouse gas emissions, impacts on biodiversity and ecosystems, hazardous waste and toxic emissions, [7] water consumption, [9] and depletion of non-renewable resources. [6] Energy sources with low environmental impact are sometimes called green energy or clean energy. The economic ...

  4. Outdoor wood-fired boiler - Wikipedia

    en.wikipedia.org/wiki/Outdoor_wood-fired_boiler

    Outdoor wood boilers are a topic of environmental controversy. [5] An improperly used or built outdoor wood boiler can produce wood smoke with excessive unburned particulate matter, but when properly burned, studies show that burning wood is still one of the most environmentally friendly heating options. In 2007, EPA began a voluntary program ...

  5. Energy poverty - Wikipedia

    en.wikipedia.org/wiki/Energy_poverty

    These projects benefit the global environment, linking local, national, and global environmental challenges and promoting sustainable livelihoods. GEF has allocated $10 billion, supplemented by more than $47 billion in cofinancing, for more than 2,800 projects in more than 168 developing countries and countries with economies in transition.

  6. Sustainable architecture - Wikipedia

    en.wikipedia.org/wiki/Sustainable_architecture

    Energy Star ground-source heat pumps can be 40% to 60% more efficient than their air-source counterparts. They are also quieter and can also be applied to other functions like domestic hot water heating. [23] In terms of initial cost, the ground-source heat pump system costs about twice as much as a standard air-source heat pump to be installed.

  7. Heating system - Wikipedia

    en.wikipedia.org/wiki/Heating_system

    Heat pumps: They can be used for heating and cooling, transferring heat using refrigerant and electricity, making them more efficient than other heating systems. [7] Heat pumps are most often used in places where the temperature stays around 40 degrees. When operating below 40 degrees heat pumps lose some of their efficiency. [8]

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