30 most populous countries, energy issues, renewable energy, energy grid, electricity production, electricity generation by fuel, mdg, millennium development goals, transmission articles, renewables articles, renewable energy resources, world energy issues, world energy trends, current global issues, shared network, sustainable development, geni, global energy network institute, international electricity transmission, grid, power, population, life expectancy, infant mortality, climate change, global warming, uhv, hvdc, hvac.