Here is an organization that is proposing a global electric grid(http://www.geni.org) to reduce greenhouse gas emissions. The transmission losses with High Voltage Direct Current are only 10% for 5000 Kilometers of power transmission which are not so bad. Although transmission lines do have an impact it does allow us to move to 100% renewable energy with existing commercial technologies and no batteries according to European research and at a lower cost than fossil fuels.
One important thing is that transmitting power long distance allows society use the most cost effective resources which reduces the cost even considering the cost of transimitting power) of reducing carbon emissions as well as practically eliminating intermittency concerns.
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