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Reducing My Carbon Footprint

I am wondering whether purchasing carbon credits would really make a difference in my carbon footprint. How do I really know that the company I purchase carbon credits from is really doing what they say? I have come across a website where you can purchase carbon credits when you take airline flights to make up for the increased fossil fuel used due to your trip. I just don’t know how it really works, does someone else really not use fuel they would have used? I don’t know how you can really prove this. Could someone explain to me how this works?