Hyundai isn't slowing down in their quest to become a global leader in green cars.Get excited for the i-oniq concept with a look back at some other eco-friendly Hyundai concepts.Hyundai has started what could be a marketing blitz in support of their new i-oniq concept set to debut at the 2012 Geneva Motor Show in March. Nothing aside from a sketch has been released, but it's more than likely a safe bet to infer that the i-oniq will either be a hybrid or hydrogen fuel-cell vehicle. Hyundai has developed some awesome eco-cars in the past, many of which have flown well under the radar.The Hyundai Blue2 is a sporty sedan concept debuted at the 2011 Seoul Motor Show. The Blue2 combines a sleek and aerodynamic body (sexy) with a hybrid hydrogen fuel-cell engine outputting 120 horsepower. The power numbers may not blow you out of the water, but things get pretty awesome when you learn that the Blue2 gets an astonishing 82.1 mpg.