Carbon offset platforms are online marketplaces that allow individuals and organizations to purchase and sometimes sell carbon offsets, which are credits used to compensate for their greenhouse gas emissions. These platforms offer transparency and traceability, connecting buyers with a variety of emission reduction projects such as reforestation and afforestation, renewable energy, methane capture, energy efficiency, and fuel switching. Additionally, some vendors offer features like carbon footprint calculators, enabling users to estimate their emissions and determine how many credits they need to purchase to achieve carbon neutrality.