A carbon offset is a service that tries to reduce the net carbon emissions of people or organizations by compensating their carbon emissions with measures for absorbing greenhouse gases. A wide variety of offset actions are available; tree planting is the most common. Renewable energy and energy conservation offsets are also popular, including emissions trading credits.
The intended goal of carbon offsets is to combat global warming. The appeal of becoming "carbon neutral" has contributed to the growth of voluntary offsets, which often are a more cost-effective alternative to reducing one's own fossil-fuel consumption.
We are currently making an online carbon offset calculator that allows you to calculate different components of your ecological footprint and then it will calculate with how many "ranger days" you can offset your carbon dioxide production and the emission of other greenhouse gasses by preventing forests in national parks, nature reserves and other protected areas from going up in flames.