Well, why yes. We are all affecting the Earth, just by living. Each of our everyday actions consumes energy and produces carbon dioxide emissions like taking holiday flights, driving our cars, heating or cooling our homes and offices.
Everything you do has an effect, the question is whether or not your effect is positive or negative. Many people and organizations around the world are changing their lifestyles to save the planet... and the truth of the matter is that altering your life to reduce your carbon emissions is the best way to do that. However, many of us are in a position where drastic changes to the way we live are impossible to make.
But the key is balance. As Sir Issac Newton said, "for every action there is an equal and opposite reaction". And that's why you're here, you want to make the lifestyle changes you can, and balance out the things you can't. That's where Carbon Offsets step in.
For more info on Carbon footprint: