One great way to go green is to practice conservation, or as I like to call it, "avoidance." In other words, avoid using gas by missing traffic, avoid using excess electricity by turning your lights off remotely, avoid waste by buying used goods. One little tool has a growing ability to help you ditch the need for the little-bit-mores that we want to cut out: the iPhone.

While other phones are starting to adopt apps and web-based programs as well, the iPhone has a seriously wide selection of apps a user can download. And with mobile service technology, there are a few energy saving solutions that link up with your phone and alert you on how and when to cut back on energy use.

We've scoured the apps store and internet for the coolest green options and programs that will help save gas, energy, time and money in four main areas of life.iPhone Apps for Gas, Driving and Car Maintenance

iPhone Apps for Traveling, Carpooling and Mass Transportation

iPhone Helps with Home Energy Use

iPhone Apps for Greener Shopping