This is the typical chicken and egg problem. No charging stations, no electric cars; no electric cars, no charging stations.
Unless scientists deliver some serious breakthroughs in battery capacity and charge time in the next few years, we're going to need charging stations everywhere: home, office, retail parking lots, shopping malls, airports, and yes, gas stations.
The US has currently about 160,000 gas stations, but research outfit Frost and Sullivan estimate we'll have 4.1 million charging stations to keep our electric cars juiced up --yes, that's 25 times the number of gas stations! And preferably powered by renewable energy (bummer! we'll also need a smart grid for that...).
Then, we'll have a real clean transportation industry, So, let's try and stay optimistic!